NEC mPD780065 Series Preliminary User's Manual page 225

Address: FF68H After reset: 00H
Symbol 7 6 5
CSIM1 CSIE10 DIR10 ATE0 LCSK10
CSIE10
Shift register operation
0 Stops operation
1 Enables operation
DIR10
0 MSB
1 LSB
ATE0
0 3-wire serial I/O mode
1 3-wire serial I/O mode with automatic transmit/receive function
LCSK10
0 SCK1 is used as port (P82) when CSIE10 = 0.
SCK1 is used for clock output when CSIE10 = 1.
1 SCK1 is fixed to high level output when CSIE10 = 0.
SCK1 is used for clock output when CSIE10 = 1.
SCL101 SCL100
0 0 External clock input to SCK1 pin
3
0 1 f /2
X
4
1 0 f /2
X
5
1 1 f /2
X
Notes 1. When CSIE10 = 0 (SIO1 operation stop status), P84/SI1, P83/SO1, P82/SCK1, P81/BUSY, and
P80/STB pins can be used as port pins.
2. When external clock input is selected by clearing SCL101 and SCL100 to 0, 0, clear bits 2 (STRB0)
and 1 (BUSY10) of the automatic data transmit/receive control register (ADTC0) to 0, 0.
Caution Be sure to set bits 2 and 3 to 0.
CHAPTER 14 SERIAL INTERFACE (SIO1)
R/W
4 3 2 1 0
0 0 SCL101 SCL100
Enables/disables operation of serial interface (SIO1)
Cleared
Enables count operation
Selects operation mode of serial interface (SIO1)
Chip enable control of SCK1 pin
Selects serial clock of serial interface (SIO1)
Note 2
(1.05 MHz)
(524 kHz)
(262 kHz)
Preliminary User's Manual U13420EJ2V0UM00
Serial counter
Port function
Serial function + port function
Start bit
Note 1
Port
225