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Discussion Groups | 68HC12 | BDM
Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).
BDM - Rivan Rivaldy - Dec 4 23:47:17 2008
Hi all,
can anybody explain to me what's the relation between BDM and the MCU
external clock? How is the data transfer in BDM related to the clock
cycle?
I'm using MC68HC912B32 MCU from Freescale. Its frequency is 8MHz. What
is the appropriate external oscillator frequency to use for this MCU?
How to select the appropriate frequency? Or is it necessary at all to
have the external oscillator connected to the MCU in order for the MCU
to work properly?
Your help is greatly appreciated.
Rivan
------------------------------------
(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )
can anybody explain to me what's the relation between BDM and the MCU
external clock? How is the data transfer in BDM related to the clock
cycle?
I'm using MC68HC912B32 MCU from Freescale. Its frequency is 8MHz. What
is the appropriate external oscillator frequency to use for this MCU?
How to select the appropriate frequency? Or is it necessary at all to
have the external oscillator connected to the MCU in order for the MCU
to work properly?
Your help is greatly appreciated.
Rivan
------------------------------------
(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )
Re: BDM - Edward Karpicz - Dec 5 0:29:10 2008
Rivan Rivaldy wrote:
> Hi all,
> can anybody explain to me what's the relation between BDM and the MCU
> external clock? How is the data transfer in BDM related to the clock
> cycle?
> I'm using MC68HC912B32 MCU from Freescale. Its frequency is 8MHz. What
Bus clock is a half of oscilator clock, or half of PLL clock (provided PLL
is available on your chip, enabled and selected). 8MHz is probably the bus
clock frequency.
BDM by default is clocked from bus clock (BDM clock = bus clock). IIRC it
can be switched to oscilator clock /2.
> is the appropriate external oscillator frequency to use for this MCU?
> How to select the appropriate frequency? Or is it necessary at all to
Hm, any frequency within the limits specified in electric specifications for
your chip.
Edward
> have the external oscillator connected to the MCU in order for the MCU
> to work properly?
>
> Your help is greatly appreciated.
>
> Rivan
> ------------------------------------
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )
> Hi all,
> can anybody explain to me what's the relation between BDM and the MCU
> external clock? How is the data transfer in BDM related to the clock
> cycle?
> I'm using MC68HC912B32 MCU from Freescale. Its frequency is 8MHz. What
Bus clock is a half of oscilator clock, or half of PLL clock (provided PLL
is available on your chip, enabled and selected). 8MHz is probably the bus
clock frequency.
BDM by default is clocked from bus clock (BDM clock = bus clock). IIRC it
can be switched to oscilator clock /2.
> is the appropriate external oscillator frequency to use for this MCU?
> How to select the appropriate frequency? Or is it necessary at all to
Hm, any frequency within the limits specified in electric specifications for
your chip.
Edward
> have the external oscillator connected to the MCU in order for the MCU
> to work properly?
>
> Your help is greatly appreciated.
>
> Rivan
> ------------------------------------
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of 68hc12 -- send a blank email to 68hc12-subscribe@yahoogroups.com )