UPD17134A Datasheet, PDF (165/292 Pages) NEC – 4-BIT SINGLE-CHIP MICROCONTROLLER

CHAPTER 13 PERIPHERAL HARDWARE
Figure 13-25. Serial Interface Control Register (2/2)
RF: 0BH
Bit 3 Bit 2
Bit 1
TM0OSEL 0
0
Read/write
R/W
Initial value when reset
0
0
0
Bit 0
SIOEN
0
Read = R, write = W
SIOEN
SIO operation enable
0
The pins P0D0/SCK, P0D1/SO, P0D2/SI
function as ports.
1
The pins P0D0/SCK, P0D1/SO, P0D2/SI
function as the serial interface.
Remark See also CHAPTER 12.
TM0OSEL _{Selecting function of the P0D3/TM0OUT pin}
0
The P0D3/TM0OUT pin is used as a port.
1
The P0D3/TM0OUT pin is used for timer 0 output.
Caution This is not related to the serial interface
directly.
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