Manual

50
AT89C5131
4136A–USB–03/03
Note: 1. These functions can only be called by user’s code. The standard bootloader cannot
decrease the security level.
READ BOOT STATUS BYTE Input Parameters:
R0 = osc freq (integer Not required, left for Philips
compatibility)
R1 = 07h
DPH = 00h
DPL = 01h (status byte)
Return Parameter
ACC = value of byte read
READ BOOT VECTOR Input Parameters:
R0 = osc freq (integer Not required, left for Philips
compatibility)
R1 = 07h
DPH = 00h
DPL = 02h (boot vector)
Return Parameter
ACC = value of byte read
FULL CHIP ERASE Input Parameters:
R0 = osc freq (integer Not required, left for Philips
compatibility)
R1 = 08h
DPH = don’t care
DPL = don’t care
Return Parameter
none
Table 41. API Calls (Continued)
API Call Parameter