Owner manual

Rev. F - 15 February, 2001 62
T89C51RD2
PROGRAM DATA PAGE
Input Parameters:
R0 = osc freq (integer Not required)
R1 = 09h
DPTR0 = address of the first byte to program in the FLASH memory
DPTR1 = address in XRAM of the first data to program (second data pointer)
ACC = number of bytes to program
Return Parameter
ACC = 00 if pass, !00 if fail
Remark: number of bytes to program is limited such as the FLASH write remains in a single 128bytes
page. Hence, when ACC is 128, valid values of DPL are 00h, or, 80h.
ERASE BOOT VECTOR
STATUS BYTE
Input Parameters:
R0 = osc freq (integer Not required, left for Philips compatibility)
R1 = 04h
DPH = 00h
DPL = don’t care
Return Parameter
none
PROGRAM SOFTWARE
SECURITY BIT
Input Parameters:
R0 = osc freq (integer Not required, left for Philips compatibility)
R1 = 05h
DPH = 00h
DPL = 00h – security bit # 1 (inhibit writing to FLASH)
01h – security bit # 2 (inhibit FLASH verify)
10h - allows ISP writing to FLASH*
11h - allows ISP FLASH verify*
Return Parameter
none
PROGRAM BOOT
STATUS BYTE
Input Parameters:
R0 = osc freq (integer Not required, left for Philips compatibility)
R1 = 06h
DPH = 00h
DPL = 00h – program status byte
ACC = status byte
Return Parameter
ACC = status byte
PROGRAM BOOT
VECTOR
Input Parameters:
R0 = osc freq (integer Not required, left for Philips compatibility)
R1 = 06h
DPH = 00h
DPL = 01h – program boot vector
ACC = boot vector
Return Parameter
ACC = boot vector
READ DEVICE DATA
Input Parameters:
R1 = 03h
DPTR = address of byte to read
Return Parameter
ACC = value of byte read
READ copy of the
MANUFACTURER ID
Input Parameters:
R0 = osc freq (integer Not required, left for Philips compatibility)
R1 = 00h
DPH = 00h
DPL = 00h (manufacturer ID)
Return Parameter
ACC = value of byte read
Table 33. API calls