Rainbow Electronics AT89C5131 - Manual (Page 47)

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AT89C5131
4136A–USB–03/03
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 (see Note 1)
11h - allows ISP Flash verify (see Note 1)
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
PROGRAM X2 MODE Input Parameters:
R0 = osc freq (integer Not required, left for Philips
compatibility)
R1 = 06h
DPH = 00h
DPL = 02h – program X2 mode at reset
ACC = value (00 or 01h)
Return Parameter
ACC = boot vector
Table 41. API Calls (Continued)
API Call Parameter