Hi all, We are using atmega128 for one of our project. I heard that it is a 8 bit microcontroller, ok its accumulator and its data bus are...

Hi all, We are using atmega128 for one of our project. I heard that it is a 8 bit microcontroller, ok its accumulator and its data bus are 8 bit width. Then what about is address bus, is it also 8 bit width? Because for this 8 bit it can address only up to 2^8 = 256 location. Then how it can address 4096 SRAM (4K) and 131072 Flash (128K). Can anybody clear me on this doubt? Thank you ...

Hi all, We are using atmega128 for one of our project. I heard that it is a 8 bit microcontroller, ok its accumulator and its data bus are...

Hi all, We are using atmega128 for one of our project. I heard that it is a 8 bit microcontroller, ok its accumulator and its data bus are 8 bit width. Then what about is address bus, is it also 8 bit width? Because for this 8 bit it can address only up to 2^8 = 256 location. Then how it can address 4096 SRAM (4K) and 131072 Flash (128K). Can anybody clear me on this doubt? Thank you ...

I am facing a redesign of an existing controller board. The original board is based on an AT91R40008-66 with an external flash of 256kB and an...

I am facing a redesign of an existing controller board. The original board is based on an AT91R40008-66 with an external flash of 256kB and an ethernet controller. I have no idea how long the R40008 will be around and with so many ARM controllers with built-in peripherals I am inclined to use a newer controller (might be an M3 core) with sufficent flash and SRAM on board and built-in ether...

Hello all, I have a CPU board which has a M16C/62P microcontroller and the microcontrollers three CS pins are connected to SRAM, EEPROM and...

Hello all, I have a CPU board which has a M16C/62P microcontroller and the microcontrollers three CS pins are connected to SRAM, EEPROM and ADC. Now I need to add LCD to the CPU board throuch the latch and I will need one more CS pin to the latch. I am thinking to expand one of the microcontrollers CS pin to get two CS pins using address decoder in a way that this microcontrollers CS ...

Hello, I am working on an industrial automation project that involves programming the i188 PC-compatible controller with embedded DOS and...

Hello, I am working on an industrial automation project that involves programming the i188 PC-compatible controller with embedded DOS and several serial ports. What options do I have for debugging on this hardware? Specifications of the controller: CPU 80188 or compatible, 40 MHz (RDC R-8820, clone of Am188ES ?) SRAM 512KBytes Flash 512KBytes EEPROM 2KBytes COM 0 Internal communica...

Hi there, We found we had to add an external RAM (SRAM or SDRAM) at the late stage of electrical design. Basically there are only 2 GPIO pins...

Hi there, We found we had to add an external RAM (SRAM or SDRAM) at the late stage of electrical design. Basically there are only 2 GPIO pins still available, otherwise the RAM has to share with other peripherals, such as SPI and I2C. I prefer to connect the external RAM with SPI bus. However, I am not sure if it is fast enough for RAM read/write. Does anybody know the typical speed of SPI...

Dear All, I'm looking for a cheap 8/16 bit uP/uC that has an external bus interface, so that about 256k of SRAM can be addressed. It needs to...

Dear All, I'm looking for a cheap 8/16 bit uP/uC that has an external bus interface, so that about 256k of SRAM can be addressed. It needs to have on-board Flash, around 32k would be good. The device doesn't need many GPIO pins, perhaps 5 or so just in case. It doesn't need ADC/DACs, USB etc like all the manfs seem to throw in them these days. It will be running a TCP/IP stack with li...

I know Xilinx and Altera have their SoC devices which are a bit high end with dual A9 type ARMs. I recently found out the Microsemi SoC which...

I know Xilinx and Altera have their SoC devices which are a bit high end with dual A9 type ARMs. I recently found out the Microsemi SoC which uses a CM3 can be bought for just $16 and a KickStart board is available for just $59. I like it. The FPGA fabric is flash based rather than SRAM so you don't need to configure it each time it powers up. The CPU has up to 512 kB flash and 144...

I just started developing programs on Atmel's AT91EB42 evaluation board using CrossStudio, which uses GNU toolchain. Two days ago I noticed that...

I just started developing programs on Atmel's AT91EB42 evaluation board using CrossStudio, which uses GNU toolchain. Two days ago I noticed that after my program was loaded into SRAM and started running, the board would reset itself after about 5 minutes. The program can be as simple as an infinite empty loop and the reset would still happen at roughly the same time. Initially, I thought it ...

Hello, I am writing the firmware for a custom board which uses the Samsung S3C4510B MCU. It board has 512KB of ROM and SRAM. I would like...

Hello, I am writing the firmware for a custom board which uses the Samsung S3C4510B MCU. It board has 512KB of ROM and SRAM. I would like to remap the memory into the following locations ROM at Bank0: 0x00000000 - 0x00080000 RAM at Bank1: 0x00100000 - 0x00180000 In my assembly program, I initialised the control register with the following instructions: ;Initialise SYSCFG register...

I'm trying to understand what my options are when it comes to interfacing memory to 8051. Am I correct that: - interfacing DRAM is complex...

I'm trying to understand what my options are when it comes to interfacing memory to 8051. Am I correct that: - interfacing DRAM is complex (for a beginner) - interfacing SRAM is more straightforward and is really the only practical memory type for fast, random access at the byte level (e.g. stack, heap) - interfacing FlashRAM is also straightforward but writing is more complex than just ...

Outside of the hobbyist ecosystem, what is the actual market size for new, non-legacy, ICs with a maximum Vcc of ~5V ? I've just picked up a...

Outside of the hobbyist ecosystem, what is the actual market size for new, non-legacy, ICs with a maximum Vcc of ~5V ? I've just picked up a few of the new Microchip 1Mbit SPI RAM ICs: http://uk.farnell.com/microchip/23lcv1024-i-p/sram-serial-1mbit-2-5-5-5v-8pdip/dp/2291921 and I was utterly amazed to see them available in this 5V capable packaging. This is a product range which until...

Hello, I have problem with .C programming! (Working with Code Vision for AVR). I have set up one PCF8591 on I2C BUS. Can You help me with...

Hello, I have problem with .C programming! (Working with Code Vision for AVR). I have set up one PCF8591 on I2C BUS. Can You help me with code, where I m doing wrong? Chip type : ATmega8515 Program type : Application Clock frequency : 4,000000 MHz Memory model : Small External SRAM size : 0 Data Stack size : 128 Communication parameters: 9600 8N1 [RS232 SPARE header] [PORT...

I'm looking for the lowest power arm with an external bus and MMU. It should be able to run Linux, even if theres no readily available toolchain...

I'm looking for the lowest power arm with an external bus and MMU. It should be able to run Linux, even if theres no readily available toolchain for it. So It should be ARM720T or higher. The Atmel ARM9 parts are the only ones that support 1.8V external bus, where I can use low-power SRAM working on 1.8V. Every other ARM is 3.3V at their external bus, including the LPC2000 ones. I'll probab...

Hello, I am doing the Dhrystone benchmark on a TC1796A microcontroller from Infineon with different compilers (TASKING, Hightec-RT GNU GCC)....

Hello, I am doing the Dhrystone benchmark on a TC1796A microcontroller from Infineon with different compilers (TASKING, Hightec-RT GNU GCC). Both compilers are set to produce highest speed optimized code, still I only get about 15 DMIPs with GNU GCC and about 20 DMIPs with TASKING. CPU is running at 150MHz, 75MHz system clock, programs run from external SRAM; no difference (as it should be...

I have a (8051) micro-controller that i would like to trace it's runtime program to understand how the program works for purpose of potentialy...

I have a (8051) micro-controller that i would like to trace it's runtime program to understand how the program works for purpose of potentialy modifying code. (The only info of program is the program binary copied off ROM ) The micro-controller consists of (usuall stuff): --------------------------------------- > Siemens 8031, ROM, SRAM > servo motors (+ driver ICs) > simple user 16 cha

(in order of importance) * internal SRAM and FLASH ROM (protected from reading) * instruction set similar to x86, including: ...

(in order of importance) * internal SRAM and FLASH ROM (protected from reading) * instruction set similar to x86, including: instruction mnemonics, addressing modes, 8-16-32bit regs, read/write 8-16-32bit from/to internal/external memory, FPU * 32megs of addressable external memory * timers/counters, external IRQs, 32bits of memory-mapped I/O * pin-coun...

* internal SRAM and FLASH ROM (protected from reading) * instruction set similar to x86, including: instruction mnemonics, ...

* internal SRAM and FLASH ROM (protected from reading) * instruction set similar to x86, including: instruction mnemonics, addressing modes, 8-16-32bit regs, read/write 8-16-32bit from/to internal/external memory, FPU * 32megs of addressable external memory * timers/counters, external IRQs, 32bits of memory-mapped I/O * pin-count around 100 (32 for data, 3...

Hi, I interfaced a Micron MT9T001 with Spartan3 evaluation board, I can save a fragment of image on SRAM, and now deciding which USB controller...

Hi, I interfaced a Micron MT9T001 with Spartan3 evaluation board, I can save a fragment of image on SRAM, and now deciding which USB controller to use so that I can transfer the raw image data to PC directly from the sensor. The bandwidth for the output data needs 30MB/s (640*480*98fps). I used FT2232 before but it supports up to 1Mb/s only, so I am finding a IC USB controller that can support...

Hello, I would like to use the STM32F207 in order to interface up to 8 can channels by means of the SJA1000 can controller IC. In addition...

Hello, I would like to use the STM32F207 in order to interface up to 8 can channels by means of the SJA1000 can controller IC. In addition there is need for Compact Flash interface, plenty of external ram and flash memory. The Flexible Static Memory Controller (FSMC) peripheral seems that it could handle these requirements, but I'm not familiar with STM32 and so I have some questions. First ...