Rainbow-electronics T89C51CC02 Manual de usuario descargar pdf (Pagina 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

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 136 137

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Rainbow-electronics T89C51CC02 Manual de usuario Pagina 44