Hi
Thanks for the answers to the last question about the function call to an
absolute address. I am trying to use the iap routines for the NXP p89v664
device. The first test is just to get the manufacturers ID but it doesn't
work.
To simplify the code I just check if I can pass by the lcall instruction. With
the lcall instruction I get 'a' to my terminal but no 'b' but if I comment it
out, I get 'ab'
while(1) {
c=serial_getchar();
serial_putchar('a');
_asm
mov R1, #0x00
mov dptr, #0x0000
lcall 0xfff0
_endasm;
serial_putchar('b');
}
I have tested many possible changes to the code but without success.
Hope I'm not off topic and many thanks.
Gudjon
Ps. The relevant part from the p89v664 datasheet is below:
All calls are made through a common interface, PGM_MTP. The
programming functions are selected by setting up the microcontroller’s
registers before making a call to PGM_MTP at FFF0H.
IAP function IAP call parameters
Read Id Input parameters:
R1 = 00H or 80H (WDT feed)
DPH = 00H
DPL = 00H = mfgr id
DPL = 01H = device id 1
DPL = 02H = device id 2
DPL = 03H = 6x/12x bit (bit 7 = 1 = 6x)
DPL = 80H = ISP version number
Return parameter(s):
ACC = requested parameter
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