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T89C51AC2-RLSI-M Datasheet(PDF) 50 Page - ATMEL Corporation

Part # T89C51AC2-RLSI-M
Description  8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM
PDF  117 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51AC2-RLSI-M Datasheet(HTML) 50 Page - ATMEL Corporation

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Draft.A - March 30, 2001
Preview - Confidential
T89C51AC2
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 32. 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 JumpBit
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



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