Rainbow-electronics T89C5115 Uživatelský manuál stáhnout pdf (Strana 41)

T89C5115

4128A–8051–04/02

Hardware Security Byte Table 25. Hardware Security byte

Default value after erasing chip: FFh

Notes: 1. Only the 4 MSB bits can be accessed by software.

2. The 4 LSB bits can only be accessed by parallel mode.

76543210

X2B BLJB - - - LB2 LB1 LB0

Bit

Number

Bit

Mnemonic Description

7X2B

X2 Bit

Set this bit to start in standard mode

Clear this bit to start in X2 mode.

6BLJB

Boot Loader Jump Bit

- 1: To start the user’s application on next RESET (@0000h) located in FM0,

- 0: 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 ... 36 37 38 39 40 41 42 43 44 45 46 ... 104 105

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Rainbow-electronics T89C5115 Uživatelský manuál Strana 41