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UPD17708 Datasheet(PDF) 54 Page - NEC

No. de pieza UPD17708
Descripción Electrónicos  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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UPD17708 Datasheet(HTML) 54 Page - NEC

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5.8 Program Status Word (PSWORD)
5.8.1 Configuration of program status word
Figure 5-9 shows the configuration of the program status word.
As shown in the figure, th program status word consists of a total of 5 bits including the lowest bit of system
register address 7EH (RPL) and 4 bits of address 7FH (PSW).
Each bit of the program status word has its own function. The 5 bits of the program status word are BCD
flag (BCD), compare flag (CMP), carry flag (CY), zero flag (Z), and index enable flag (IXE).
Figure 5-9. Configuration of Program Status Word
7EH
RPL
0
0
0
Retained
7FH
PSW
0
0
0
Retained
b3
b2
b1
b0
B
C
D
b3
C
M
P
b2
C
Y
b1
Z
b0
I
X
E
Program status word
(PSWORD)
Address
Name
Symbol
Bit
Data
Clock stop
Power-ON reset
WDT&SP reset
CE reset



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