214
CHAPTER 14 SERIAL INTERFACE (SIO1)
Preliminary User’s Manual U13420EJ2V0UM00
Figure 14-2. Format of Serial Operation Mode Register 1 (CSIM1)
Address: FF68H After reset: 00H R/W
CSIE10
Enables/disables operation of serial interface (SIO1)
Shift register operation
Serial counter
Port
Note 1
0
Stops operation
Cleared
Port function
1
Enables operation
Enables count operation
Serial fu port function
DIR10
Specifies first bit of serial transfer data
0
MSB
1
LSB
ATE0
Selects operating mode of serial interface (SIO1)
0
3-wire serial I/O mode
1
3-wire serial I/O mode with automatic transmit/receive function
LCSK10
Chip enable control of SCK1 pin
0
SCK1 is used as a 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
Selects serial clock of serial interface (SIO1)
0
0
External clock input to SCK1 pin
Note 2
0
1
f
X
/2
3
(1.05 MHz)
1
0
f
X
/2
4
(524 kHz)
1
1
f
X
/2
5
(262 kHz)
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.
Remarks 1. f
X
: Main system clock oscillation frequency
2. ( ): f
X
= 8.38 MHz
7
CSIE10
6
DIR10
5
ATE0
4
LCSK10
3
0
2
0
1
SCL101
0
SCL100
Symbol
CSIM1
Содержание mPD780065 Series
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