What is the lowest-power 32-bit MCU?

Started by Ghazan Haider in comp.arch.embedded15 years ago 8 replies

Specifically which MCU that can boot Linux has the lowest operating power? I imagine it would be a low-clock arm, I intend to lower the clock...

Specifically which MCU that can boot Linux has the lowest operating power? I imagine it would be a low-clock arm, I intend to lower the clock further for my application. I'm hoping for less than 15mW at 3V, more like 5mW if at all possible. LCD controller preferable but beside that and IO lines no other options required. Has any company come out with low-power series of 32-bit MCUs? I coul...


xmega slave spi problem

Started by theAdib in comp.arch.embedded9 years ago 1 reply

Hi all, i'am hunting this problem since a couple of days ... All I need is are 2 synchronous serial data-streams for my selfmade modulator....

Hi all, i'am hunting this problem since a couple of days ... All I need is are 2 synchronous serial data-streams for my selfmade modulator. the clock phase must be in synch. My idea was to use a master spi to generate the master stream and a spi slave module as second generator that is clocked by the clock out put from the first master. For the first I use USART in master spi mode. fo...


Using a PIC microcontroller to interface with a DS1302 real time clock

Started by ssylee in comp.arch.embedded12 years ago 3 replies

I'm not sure if posting this is a good idea. The question is posted in here, but I would like a second opinion to further help my moves on the...

I'm not sure if posting this is a good idea. The question is posted in here, but I would like a second opinion to further help my moves on the debugging process. Feel free to ask me for more information that may help. http://www.electro-tech-online.com/micro-controllers/35071-using-pic-microcontroller-interface-d s1302-real-time-clock.html


Issues on clockless uart

Started by Shashi in comp.arch.embedded15 years ago 12 replies

Hi, I'm doing a project in clockless uart..as u know that the primary function of uart is parallel to serial conversion while transmitting and...

Hi, I'm doing a project in clockless uart..as u know that the primary function of uart is parallel to serial conversion while transmitting and serial to paralel conversion while receiving..I was wondering if someone could tell me as how can i do a parallel to serial conversion and vice versa without using a clock. Note: This is a circuit whoch doesnt use a clock at all/ Asynchronous Circu...


H8S 2674R All Module Clock Stop Mode??

Started by Dave Madsen in comp.arch.embedded14 years ago 4 replies

We are using a Renesas H8S 2674R processor and cannot get the specified current consumption numbers when entering the All Module Clock Stop...

We are using a Renesas H8S 2674R processor and cannot get the specified current consumption numbers when entering the All Module Clock Stop mode. Has anyone successfully used this mode in this family of H8S processors?


PIC16C62B to 16F872, no clock CLKOUT?

Started by Mark A. Odell in comp.arch.embedded15 years ago 1 reply

I'm wondering if there is some well known issue with the 16F872 WRT using the RC oscillator mode. I was told that the 'F872 was a...

I'm wondering if there is some well known issue with the 16F872 WRT using the RC oscillator mode. I was told that the 'F872 was a pin-compatible replacement for the 'C62B (ignoring the A/D). When the 'C62B is in the socket I get a nice clock out signal on pin 10, CLKOUT. Quickly swapping in the 'F872 I get a DC low-level and pin 9, CLKIN is a DC high-level. Anyone? Thanks. -- - Mark ...


Arbiter design problem?

Started by Davy in comp.arch.embedded13 years ago 5 replies

Hi all, I have two problem when reading the paper from [url]http://www.siliconlogic.com/pdf/Arbiters_MattWeber_SLE.pdf [/url] [1] Is...

Hi all, I have two problem when reading the paper from [url]http://www.siliconlogic.com/pdf/Arbiters_MattWeber_SLE.pdf [/url] [1] Is Arbiter pure comb logic? If yes, shall its comb logic delay be constrained to within one clock cycle? [2] Shall one request and one grant both hold only one clock cycle? Best regards, Davy


Cortex A9 performance counters

Started by mart...@yahoo.com in comp.arch.embedded8 years ago

I have a specific question: Cortex A9 can count different types of events with Performance Monitoring Unit. What's exactly difference between...

I have a specific question: Cortex A9 can count different types of events with Performance Monitoring Unit. What's exactly difference between Integer Clock Enabled and Data Engine Clock Enabled types of events? And is there any chance to count all core clocks even if core makes WFI call? Thank you.


Silabs C8051F412 --> Programming error after setting clock to 49MHz

Started by in comp.arch.embedded8 years ago 3 replies

Hello, after programming the clock of the chip C8051F412 to 49MHz I get the error message "Target fail to response"! So I'm not longer able to...

Hello, after programming the clock of the chip C8051F412 to 49MHz I get the error message "Target fail to response"! So I'm not longer able to programm the chip. The programmer works well (I have it tested on a other target). The hardware was not changed, so it's only a software issue. **?? How can I now erase the flash ??** Flash tools does also not help. The code of dead looks so: ...


Bluetooth clocking

Started by Vladimir Vassilevsky in comp.arch.embedded8 years ago

The Bluetooth stack supports for a 64kbps u-Law/A-Law channels for telephony purpose. How does the clocking works in those channels? I.e....

The Bluetooth stack supports for a 64kbps u-Law/A-Law channels for telephony purpose. How does the clocking works in those channels? I.e. which side of the Bluetooth link is a clock master and which is a slave? Is the clock master/slave selection application dependent or is it defined in the protocol? Many bluetooth modules provide I2S interface for direct connection to audio code...


ROM wait states

Started by RIYA in comp.arch.embedded10 years ago 2 replies

can anyone explain me to calculate the wait states needed? Suppose we are using 120 nanosecond ROMs, which have valid data on the bus 120 ns...

can anyone explain me to calculate the wait states needed? Suppose we are using 120 nanosecond ROMs, which have valid data on the bus 120 ns after the falling edge on the Output Enable line with a clock rate of 25 MHz (which means a clock cycle of 40 nanoseconds). How many wait states must the microprocessor insert into each bus cycle that reads from the ROM? -----------------...


ALP for Real Time Clock using timer unit of HC12

Started by alex99 in comp.arch.embedded10 years ago 5 replies

HI, I am implementing an ALP program to implement a real time clock to display hour,minute,second using features available in a timer unit....

HI, I am implementing an ALP program to implement a real time clock to display hour,minute,second using features available in a timer unit. Digits have to displayed on one of the GPIO ports of HC12 micro-controller. I do know how to proceed on this in C language but am a newbie in micro-controllers and assembly programming - was hoping that someone could point me in the right direction -- p...


Atmel ATTiny 861 Frequency @ 3.3V

Started by Holger Metschulat in comp.arch.embedded7 years ago 1 reply

Hi all, just looked through the ATTiny 861 datasheet with the "new" options to use a High-Frequency PLL clock with the 8 MHz calibrated...

Hi all, just looked through the ATTiny 861 datasheet with the "new" options to use a High-Frequency PLL clock with the 8 MHz calibrated oscillator to clock the processor and the periphials. So by using this combination, the processor can run at 16 MHz with the internal RC oscillator. However, the datasheet also says that the maximum "speed" at 3.3V is 10 MHz. It doesn't say what this "10...


microcontroller in SPI Slave mode when clock is continous and no SSEL

Started by blisca in comp.arch.embedded7 years ago 6 replies

Please can i have your help? I'm confused about the following situation: A transceiver is connected in SPI mode to a...

Please can i have your help? I'm confused about the following situation: A transceiver is connected in SPI mode to a microcontroller(LPC12xx). The transceiver outputs a continous clock ,and it does not drive any SSEL line to enable the SPI section of the microcontroller. The microcontroller should decide when to start a data transmission,but just enabling its SPI module it goes in Busy...


16Mhz AVR

Started by RCS in comp.arch.embedded15 years ago 4 replies

Could anyone help?... I am having trouble switching from the 8mhz internal clock to an external 16mhz crystal on a AVR mega32. I was able to...

Could anyone help?... I am having trouble switching from the 8mhz internal clock to an external 16mhz crystal on a AVR mega32. I was able to switch from the 1Mhz internal clock to the 8Mhz internal. But I can't get the external crystal to function? What is the procedure? I have already messed up four M32's and still can't get one to work at 16Mhz. I am using 22pf caps on the crystal...


msp430 MCLK doesn't work with XT2 clock source

Started by el_777 in comp.arch.embedded14 years ago 2 replies

I'm working with the ms430-449STK2 olimex development kit that IAR distributes with its software, "XT2 = 8Mhz" The problem is that I can't...

I'm working with the ms430-449STK2 olimex development kit that IAR distributes with its software, "XT2 = 8Mhz" The problem is that I can't select the XT2 as a clock source for the MCLK. In fact I make this instruction: FLL_CTL1 = (SELS + SELM1) & (~XT2OFF); and the IAR IDE show me that the right bits are sets, as follows: SELM1 = 1 SELM0 = 0 XT20FF= 0 SELS = 1 However the MCLK w...


AVR external crystal setup?

Started by Steve & Alayne Maeciante in comp.arch.embedded16 years ago 1 reply

Could anyone help?... I am having trouble switching from the 8mhz internal clock to an external 16mhz crystal on a AVR mega32. I was able to...

Could anyone help?... I am having trouble switching from the 8mhz internal clock to an external 16mhz crystal on a AVR mega32. I was able to switch from the 1Mhz internal clock to the 8Mhz internal. But I can't get the external crystal to function? What is the procedure? I have already messed up four M32's and still can't get one to work at 16Mhz. I am using 22pf caps on the crystal...


AT91SAM7S SPI NCPHA Setting Opposite Data Sheet Description?

Started by Blue in comp.arch.embedded13 years ago 1 reply

Has anyone here used the SPI port on the AT91SAM7SXXX parts? If so, have you observed the same problem I have? It appears to me that the...

Has anyone here used the SPI port on the AT91SAM7SXXX parts? If so, have you observed the same problem I have? It appears to me that the edge used to capture data is reversed from what the data sheet shows. I am using CPOL=0, NCPHA=1. According to the data sheet, this should cause the SPI clock to idle low, and to capture MISO data on rising clock edges, including the first rising ed...


16-bit SPI trying to read from 22-clock cycle ADC

Started by Bill in comp.arch.embedded10 years ago 40 replies

Hi, I'm trying to pull out data from the ADS8320 (a 16-bit ADC by Analog Devices. See bottom of page 10...

Hi, I'm trying to pull out data from the ADS8320 (a 16-bit ADC by Analog Devices. See bottom of page 10 in http://focus.ti.com/lit/ds/symlink/ads8320.pdf ) using the SPI in an AT91SAM7S256. The problem is that the ADC needs 6 extra clock cycles to sample the analog signal, before the 16 cycles that will output each of the conversion result bits. So, a complete ADC cycle involves a minimum...


LCD controller setting.

Started by JY Kim in comp.arch.embedded12 years ago

Hello. I am developing with samsung 2410 and currently activating LCD. Now LCD works somehow but not perpectly. The problem is that I have...

Hello. I am developing with samsung 2410 and currently activating LCD. Now LCD works somehow but not perpectly. The problem is that I have coded LCD to toggle between red and white and lower 1/3 of LCD displays opposite color. When upper 2/3 displays red, lower 1/3 displays white. vice versa. Typical dot clock of LCD module is 24.5Mhz, but I am driving LCD with 12M dot clock for unavoidable...