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UPD17708 Datasheet(PDF) 136 Page - Renesas Technology Corp

No. de pieza UPD17708
Descripción Electrónicos  MOS INTEGRATED CIRCUIT
PDF  358 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD17708 Datasheet(HTML) 136 Page - Renesas Technology Corp

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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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