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AT83SND1CXXX-ROTUL 데이터시트(PDF) 23 Page - ATMEL Corporation

부품명 AT83SND1CXXX-ROTUL
상세설명  Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
PDF  212 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT83SND1CXXX-ROTUL 데이터시트(HTML) 23 Page - ATMEL Corporation

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7
4109J–8051–10/06
AT8xC51SND1C
Reset Value = XXXX 00X0b
Note:
1. ENBOOT bit is only available in AT89C51SND1C product.
6.8
Hardware Bytes
Table 23. HSB Byte – Hardware Security Byte
Reset Value = XXUU UXXX, UUUU UUUU after an hardware full chip erase.
Note:
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 are deliv-
ered with BLJB programmed.
3. Bits 0 to 3 (LSN) can only be programmed by hardware mode.
3GF3
General Flag
This bit is a general-purpose user flag.
20
Always Zero
This bit is stuck to logic 0 to allow INC AUXR1 instruction without affecting GF3
flag.
1-
Reserved for Data Pointer Extension.
0DPS
Data Pointer Select Bit
Set to select second data pointer: DPTR1.
Clear to select first data pointer: DPTR0.
Bit
Number
Bit
Mnemonic
Description
7654
3210
X2B
BLJB
-
-
-
LB2
LB1
LB0
Bit
Number
Bit
Mnemonic
Description
7X2B
(1)
X2 Bit
Program this bit to start in X2 mode.
Unprogram (erase) this bit to start in standard mode.
6BLJB
(2)
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.
5 - 4
-
Reserved
The value read from these bits is always unprogrammed. Do not program these
bits.
3-
Reserved
The value read from this bit is always unprogrammed. Do not program this bit.
2 - 0
LB2:0
Hardware Lock Bits
Refer to for bits description.
Table 24. SBV Byte – Software Boot Vector
7654
3210
ADD15
ADD14
ADD13
ADD12
ADD11
ADD10
ADD9
ADD8



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