AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 22

• Manufacturer Part Number: AT83C51SND1C_03
• Description: Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
• Manufacturer: ATMEL [ATMEL Corporation]

Hardware Bytes
22
AT8xC51SND1C
Table 22. HSB Byte – Hardware Security Byte
Reset Value = XXUU UXXX, UUUU UUUU after an hardware full chip erase.
Note:
Table 23. SBV Byte – Software Boot Vector
Reset Value = XXXX XXXX, UUUU UUUU after an hardware full chip erase.
Table 24. SSB Byte – Software Security Byte
Reset Value = XXXX XXXX, UUUU UUUU after an hardware full chip erase.
Number
Number
Number
ADD15
SSB7
X2B
5 - 4
2 - 0
7 - 0
7 - 0
Bit
Bit
Bit
7
7
7
7
6
3
1. X2B initializes the X2 bit in CKCON during the reset phase.
2. In order to ensure boot loader activation at first power-up, AT89C51SND1C products
3. Bits 0 to 3 (LSN) can only be programmed by hardware mode.
are delivered with BLJB programmed.
Mnemonic Description
Mnemonic Description
Mnemonic Description
ADD15:8
ADD14
SSB7:0
BLJB
BLJB
SSB6
X2B
LB2:0
Bit
Bit
Bit
6
6
6
-
-
(1)
(2)
X2 Bit
Program this bit to start in X2 mode.
Unprogram (erase) this bit to start in standard mode.
Boot Loader Jump Bit
Program this bit to execute the boot loader at address F000h on next reset.
Unprogram (erase) this bit to execute user’s application at address 0000h on
next reset.
Reserved
The value read from these bits is always unprogrammed. Do not program these
bits.
Reserved
The value read from this bit is always unprogrammed. Do not program this bit.
Hardware Lock Bits
Refer to for bits description.
MSB of the user’s boot loader 16-bit address location
Refer to the boot loader datasheet for usage information (boot loader dependent)
Software Security Byte Data
Refer to the boot loader datasheet for usage information (boot loader dependent)
ADD13
SSB5
5
5
5
-
ADD12
SSB4
4
4
4
-
ADD11
SSB3
3
3
3
-
ADD10
SSB2
LB2
2
2
2
ADD9
SSB1
LB1
1
1
1
4109E–8051–06/03
ADD8
SSB0
LB0
0
0
0