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UPD17015GS Datasheet(PDF) 23 Page - NEC

Part # UPD17015GS
Description  4-BIT SINGLE-CHIP MICROCONTROLLER FOR PORTABLE RADIOS
PDF  120 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17015GS Datasheet(HTML) 23 Page - NEC

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µPD17015
5.2
PROGRAM STATUS WORD (PSWORD)
5.2.1
Format of Program Status Word
Fig. 5-2 shows the format of the program status word.
As shown in Fig. 5-2, the program status word consists of 5 bits: the least significant bit of 7EH (RPL) of the system
register, and the 4 bits of address 7FH (PSW) of the system register. Bit 0 of 7FH is always 0.
A different function is assigned to each bit of the program status word; the program status word consists of a BCD
flag (BCD), compare flag (CMP), carry flag (CY), zero flag (Z), and index enable flag (IXE).
Fig. 5-2 Format of Program Status Word
Address
7EH
7FH
Program status word
(PSWORD)
RPL
PSW
Bit
b3
b2
b1
b0
b3
b2
b1
b0
Data
B
C
D
C
M
P
C
Y
Z
0
0
0
0
Power-on
Clock stop
CE
0
0
0
0
0
0
Register
Symbol
5.2.2
Program Status Word Functions
The program status word is used to set conditions for transfer instructions and operations by the arithmetic logic
unit (ALU), and also to indicate the states of the results of operations.
Fig. 5-3 outlines the function of each flag of the program status word.
See Chapter 7 for details.



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