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UPD17708 データシート(PDF) 246 Page - NEC

部品番号 UPD17708
部品情報  4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM
PDF  356 Pages
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メーカー  NEC [NEC]
ホームページ  http://www.nec.com/
Logo NEC - NEC

UPD17708 データシート(HTML) 246 Page - NEC

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µPD17704, 17705, 17707, 17708, 17709
Figure 16-17. Configuration of Serial I/O1 Mode Selection Register
16.3.3 Clock counter
The clock counter is a wrap-around counter that counts the rising edges of the clock.
Because this counter directly reads the status of the clock pin, whether the clock is an internal clock or external
clock cannot be identified.
The contents of the clock counter cannot be directly read by software.
Name
Flag symbol
b3
S
I
O
1
T
S
b2
S
I
O
1
H
I
Z
b1
S
I
O
1
C
K
1
b0
S
I
O
1
C
K
0
Address
1DH
Read/Write
R/W
Serial I/O1 mode selection
Power-ON reset
WDT&SP reset
CE reset
Clock stop
0
1
0
1
0
0
0
0
External clock input
187.50 kHz
375.00 kHz
46.875 kHz
Selects shift clock of serial interface 1
0
0
0
0
0
0
0
0
0
0
1
1
General-purpose I/O port
Serail data output pin
Selects function of P0B1/SO1 pin
0
1
0
0
0
0
Stops (wait status)
Starts
Start or stops operation of serial communication
0
1



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