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UPD17708 Datasheet(PDF) 134 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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Fabricante Electrónico  NEC [NEC]
Página de inicio  http://www.nec.com/
Logo NEC - NEC

UPD17708 Datasheet(HTML) 134 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
134
12.3.2 Interrupt stack pointer of system register
The interrupt stack pointer of the system register detects the nesting level of interrupts. The interrupt stack
pointer can be only read and cannot be written.
The configuration and function of the interrupt stack pointer are illustrated below.
Name
Flag symbol
b3
0
b2
S
Y
S
R
S
P
2
b1
S
Y
S
R
S
P
1
b0
S
Y
S
R
S
P
0
Address
08H
Read/Write
R
Interrupt stack pointer of
system registers
01
1
1
0
0
0
1
1
1
Use prohibited
4 levels (INTSK1)
3 levels (INTSK2)
2 levels (INTSK3)
1 level (INTSK4)
0 level
Detects level of interrupt stack of system registers
Fixed to “0”
0
1
0
1
0
1
0
0
1
1
0
0
0
0
0
0
1
1
Power-ON reset
WDT&SP reset
CE reset
Retained
Clock stop



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