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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 289頁(yè)

  • NEC   NEC

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CHAPTER 7
SYSTEM REGISTER (SYSREG)
7.7 PROGRAM STATUS WORD (PSWORD)
7.7.1 Program Status Word Configuration
Figure 7-16 shows the configuration of the program status word.
Figure 7-16. Program Status Word Configuration
Address
Name
(RP)
Symbol
Bit
b
3
RPL
b
2
b
1
b
0
B
C
D
Data
b
3
C
M
P
7EH
7FH
Program status
word (PSWORD)
PSW
b
2
C
Y
b
1
Z
b
0
I
X
E
Initial value when reset
0
0
As shown in Figure 7-16, the program status word consists of five bits; the least significant bit of system register
address 7EH (RPL) and all four bits of system register address 7FH (PSW).
The program status word is divided into the following 1-bit flags: Binary coded decimal flag (BCD), compare flag
(CMP), carry flag (CY), zero flag (Z), and the index enable flag (IXE).
All register bits are cleared to 0 at reset and at saved at interrupt stack register.
61

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