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D17133CS Datasheet(PDF) 154 Page - NEC

Part # D17133CS
Description  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  289 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

D17133CS Datasheet(HTML) 154 Page - NEC

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CHAPTER 13
PERIPHERAL HARDWARE
139
Figure 13-15. Serial Interface Control Register (1/2)
RF: 1AH
Read = R, write = W
SIOCK1
0
0
1
1
SIOCK0
0
1
0
1
Serial Clock Selection
External clock (SCK pin)
fX/16
fX/128
fX/1024
Function Selection of the P0D1/SO pin
Serial data output (SO pin)
Input port (P0D1 pin)
Confirmation of Shift Register Operation Status
(at Reading)
The shift register is in the stop status.
The shift register is operating.
Start and Stop of Serial Transmission (at Writing)
Forced termination of the shift register.
Disables intermediate restart.
Start of shift register operation
• At internal clock selection
Starts operating internal devided signal of a
system clock (fX) as a serial clock
• At external clock selection
Starts operation in synchronization with an SCK
pin falling edge.
SIOHIZ
0
1
SIOTS
0
1
Remark SIOTS is automatically cleared to 0 when serial
transmission is completed.
Read/write
Initial value when reset
Bit 3
SIOTS
0
Bit 2
SIOHIZ
0
Bit 1
SIOCK1
0
Bit 0
SIOCK0
0
R/W
SIOTS
0
1



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