Table 74. API Call Summary (Continued)
Command
R1
A
DPTR0
DPTR1
Returned Value
Command Effect
Fuse value
00h or 01h
PROGRAM X2 FUSE
0Ah
0008h
XXh
none
Program X2 fuse bit with ACC
Fuse value
00h or 01h
PROGRAM BLJB
FUSE
0Ah
0004h
XXh
none
Program BLJB fuse bit with ACC
READ HSB
0Bh
0Eh
0Eh
XXh
XXh
XXh
XXh
XXXXh
DPL = 00h
DPL = 01h
XXXXh
XXh
XXh
XXh
XXh
ACC = HSB
ACC = ID1
Read Hardware Byte
Read boot ID1
READ BOOT ID1
READ BOOT ID2
ACC = ID2
Read boot ID2
READ BOOT VERSION 0Fh
ACC = Boot_Version
Read bootloader version
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AT89C51RB2/RC2
4180E–8051–10/06