NEC 78014Y Series User Manual page 415

(2) Serial operating mode register 1 (CSIM1)
This register sets serial interface channel 1 serial clock, operating mode, operation enable/stop and automatic
transmit/receive operation enable/stop.
CSIM1 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets CSIM1 to 00H.
Symbol
CSIM1 CSIE1
CSIM11 CSIM10 Serial Interface Channel 1 Clock Selection
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CSIE CSIM PM20 P20 PM21 P21 PM22 P22
Notes
Remark ×
CHAPTER 17 SERIAL INTERFACE CHANNEL 1
Figure 17-3. Serial Operating Mode Register 1 Format
<7> 6 <5> 4
DIR ATE 0
0 x Clock externally input to SCK1 pin
1 0 8-bit timer register 2 (TM2) output
1 1 Clock specified with bits 4 to 7 of timer clock select register 3 (TCL3)
ATE Serial Interface Channel 1 Operating Mode Selection
0 3-wire serial I/O mode
1 3-wire serial I/O mode with automatic transmit/receive function
DIR Start Bit
0 MSB
1 LSB
1 11
Note 2 Note 2 Note 2 Note 2 Note 2 Note 2
× × × × × ×
0
1 0 1
Note 3 Note 3
×
1 0 0
1 0
1. If the external clock input has been selected with CSIM11 set to 0, set bit 1 (BUSY1) and bit 2 (STRB)
of the automatic data transmit/receive control register (ADTC) to 0 and 0, respectively.
2. Can be used freely as port function.
3. Can be used as P20 (CMOS input/output) when only transmitter is used (Set bit 7 (RE) of ADTC to 0).
: don't care
PMxx : Port mode register
Pxx : Output latch of port
3 2 1 0
0 0 CSIM11 CSIM10
Note 1
Shift Register
Serial Clock Counter
1 Operation
Operation
Control
Operation stop Clear
×
×
Operation Count
enable operation
1
Address When Reset R/W
FF68H 00H R/W
SI1 Pin Function SO1 Pin Function
SI1/P20 (Input) SO1 (CMOS output)
SI1/P20 SO1/P21
Pin Function Pin Function
P20 P21
(CMOS (CMOS
input/output) input/output)
SI1 Note 3 SO1
(Input) (CMOS output) (Input)
SCK1/P22
Pin Function
P22
(CMOS
input/output)
SCK1
SCK1
(CMOS output)
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