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UPD17708 Datasheet(PDF) 93 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/
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UPD17708 Datasheet(HTML) 93 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
10.3 Data Buffer Stack Pointer
The data buffer stack pointer detects the multiplexing level of the data buffer stack registers.
When the “PUT” instruction is executed to the data buffer stack, the value of the data buffer stack pointer
is incremented by one; when the “GET” instruction is executed, the value of the pointer is decremented by one.
The data buffer stack pointer can be only read and cannot be written.
The configuration and function of the data buffer stack pointer are illustrated below.
Name
Flag symbol
b3
0
b2
0
b1
D
B
F
S
P
1
b0
D
B
F
S
P
0
Address
04H
Read/Write
R
Data buffer stack pointer
Power-ON reset
WDT&SP reset
CE reset
Clock stop
0
1
0
1
Level 0
Level 1
Level 2
Level 3
Detects multiplexing level of data buffer stack
0
0
1
1
Retained
Fixed to “0”
00
0
0
0
0
0
0



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