MC68HC908GP32, Monitor mode.

Hello.

I have problem with Monitor Mode in MC68HC908GP32. I try to programme 
this uC so I use PROG08SZ programmer (on Windows 2003). I made Normal 
Monitor Mode Circuit from AN2317/D Application Note (page 9):
http://www.freescale.com/files/microcontrollers/doc/app_note/AN2317.pdf
but I used a 8 MHz oscillator. My GP32 connections are show below:
	RST -> Vdd (with pull-up resistor)
	IRQ -> Vtst (8.35V)
	Vdda, Vdd, Vddad -> Vdd (5V)
	CGMXFC -> GND
	PTA7, PTC1, PTC3 -> GND
	Vss, Vssad, Vssa -> GND
	PTC0 -> Vdd
I think that are everything all right, but PROG08SZ always showns this 
error:
	Attempting half baud reset of HC08 device ... Unsuccessful
	Trying Security $FFFFFFFFFFFFFFFF
	(Failure of 68HC08 to respond properly. Check connections)

Please tell me that I do wrong?
I thank very much in advance for your help.

PS. Please forgive my English, but I have still learnt it.
-- 
Piotr

Piotr wrote:

> Hello.
> 
> I have problem with Monitor Mode in MC68HC908GP32. I try to programme 
> this uC so I use PROG08SZ programmer (on Windows 2003). I made Normal 
> Monitor Mode Circuit from AN2317/D Application Note (page 9):
> http://www.freescale.com/files/microcontrollers/doc/app_note/AN2317.pdf
> but I used a 8 MHz oscillator. My GP32 connections are show below:
>     RST -> Vdd (with pull-up resistor)
>     IRQ -> Vtst (8.35V)
>     Vdda, Vdd, Vddad -> Vdd (5V)
>     CGMXFC -> GND
>     PTA7, PTC1, PTC3 -> GND
>     Vss, Vssad, Vssa -> GND
>     PTC0 -> Vdd
> I think that are everything all right, but PROG08SZ always showns this 
> error:
>     Attempting half baud reset of HC08 device ... Unsuccessful
>     Trying Security $FFFFFFFFFFFFFFFF
>     (Failure of 68HC08 to respond properly. Check connections)
> 
> Please tell me that I do wrong?
> I thank very much in advance for your help.
> 
> PS. Please forgive my English, but I have still learnt it.

I would bet that the 8 MHz oscillator is the problem.  The internal
monitor is going to assume the 9.8304 MHz shown in the App Note
when doing the baud rate calculations to get 9600 baud.  When you
use the 8 MHz it is probably operating at 9600 * 8/9.8304 = 7812 baud.
Just a guess.  If you have a 10 MHz oscillator that is probably close
enough.

Dave Rooney