Rainbow Electronics T89C51CC02 - Manual (Page 44)

44 Rev.A - May 17, 2001
Preliminary
T89C51CC02
10.7. Hardware Byte
Default value after erasing chip: FFh
NOTE:
Only the 4 MSB bits can be access by software.
The 4 LSB bits can only be access by parallel mode.
Figure 24. Hardware byte
7 6 5 4 3 2 1 0
X2B BLJB - - - LB2 LB1 LB0
Bit Number Bit Mnemonic Description
7 X2B
X2 Bit
Set this bit to start in standard mode
Clear this bit to start in X2 mode.
6 BLJB
Boot Loader Jump Bitt
Clear (=1)this bit to start the user’s application on next RESET (@0000h) located in FM0,
Set (=0)this bit to start the boot loader(@F800h) located in FM1.
5-3 -
Reserved
The value read from these bits are indeterminate.
2-0 LB2:0 Lock Bits