Rainbow-electronics AT89C5132 Bedienungsanleitung PDF herunterladen (Seite 23)

AT8xC5132

4173A–8051–08/02

Hardware Bytes Table 21. HSB Byte – Hardware Security Byte

Reset Value = XXUU UXXX, UUUU UUUU after an hardware full chip erase.

Notes: 1. X2B initializes the X2 bit in CKCON during the reset phase.

2. Using the AT89C5132 (Flash Version) the system can boot either in standard or X2

mode depending on the X2B value. Using AT83C5132 (ROM Version) the system

always boots in standard mode. X2B bit can be changed to X2 mode later by

software.

3. Bits 0 to 3 (MSN) can only be programmed by hardware mode.

Table 22. SBV Byte – Software Boot Vector

Reset Value = XXXX XXXX, UUUU UUUU after an hardware full chip erase.

Table 23. SSB Byte – Software Security Byte

Reset Value = XXXX XXXX, UUUU UUUU after an hardware full chip erase.

76543210

X2B BLJB - - - LB2 LB1 LB0

Bit

Number

Bit

Mnemonic Description

7X2B

(1)(2)

X2 Bit

Program this bit to start in X2 mode.

Unprogram (erase) this bit to start in standard mode.

6BLJB

Boot Loader Jump Bit

Program this bit to execute the bootloader at address F000h on next reset.

Unprogram (erase) this bit to execute user’s application at address 0000h on

next reset.

5 - 4 -

Reserved

The values read from these Bits are always unprogrammed. Do not program

these Bits.

Reserved

The values read from this bit is always unprogrammed. Do not program this bit.

2 - 0

(3)

LB2:0

Hardware Lock Bits

Refer to Table 21 for Bits description.

76543210

ADD15 ADD14 ADD13 ADD12 ADD11 ADD10 ADD9 ADD8

Bit

Number

Bit

Mnemonic Description

7 - 0 ADD15:8

MSB of the user’s bootloader 16-bit address location

Refer to the AT8xC5132 datasheet for usage information (bootloader

dependent).

76543210

SSB7SSB6SSB5SSB4SSB3SSB2SSB1SSB0

Bit

Number

Bit

Mnemonic Description

7 - 0 SSB7:0

Software Security Byte Data

Refer to the AT8xC5132 datasheet for usage information (bootloader

dependent).

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 161 162

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