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T89C51AC2-RLSI-M データシート(PDF) 35 Page - ATMEL Corporation

部品番号 T89C51AC2-RLSI-M
部品情報  8-bit MCU with 32K bytes Flash, 10 bits A/D and EEPROM
PDF  117 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51AC2-RLSI-M データシート(HTML) 35 Page - ATMEL Corporation

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Draft.A - March 30, 2001
35
Preview - Confidential
T89C51AC2
8.5. Registers
PSW (S:8Eh)
Program Status Word Register.
Reset Value= 0000 0000b
Figure 23. PSW Register
7
6
5
4
3
2
1
0
CY
AC
F0
RS1
RS0
OV
F1
P
Bit Number Bit Mnemonic
Description
7CY
Carry Flag
Carry out from bit 1 of ALU operands.
6AC
Auxiliary Carry Flag
Carry out from bit 1 of addition operands.
5F0
User Definable Flag 0.
4-3
RS1:0
Register Bank Select Bits
Refer to Table 15 for bits description.
2OV
Overflow Flag
Overflow set by arithmetic operations.
1F1
User Definable Flag 1.
0P
Parity Bit
Set when ACC contains an odd number of 1’s.
Cleared when ACC contains an even number of 1’s.



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