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CHAPTER 16 SERIAL INTERFACE (SIO31)
Preliminary User’s Manual U13420EJ2V0UM00
16.4.2 3-wire serial I/O mode
The 3-wire serial I/O mode is useful for connection to a peripheral I/O incorporating a clock-synchronous serial
interface, a display controller, etc.
This mode executes data transfers via three lines: a serial clock line (SCK31), serial output line (SO31), and serial
input line (SI31).
(1) Register settings
3-wire serial I/O mode is set by the serial operation mode register 31 (CSIM31).
CSIM31 can be set by a 1-bit or 8-bit memory manipulation instructions.
RESET input sets CSIM31 to 00H .
Caution
In 3-wire serial I/O mode, set the port mode register (PMXX) as follows. In each case, set he output
latch to 0.
• During serial clock output (master transmission or master reception)
Set P90 (SCK31) to output mode (PM90 = 0)
• During serial clock input (slave transmission or slave reception)
Set P90 to input mode (PM90 = 1)
• During transmit/transmit and receive mode
Set P91 (SO31) to output mode (PM91 = 0)
• During receive mode
Set P92 (SI31) to input mode (PM92 = 1)
Address: FFB1H After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
CSIM31
CSIE31
0
0
0
0
MODE1
SCL311
SCL310
CSIE31
Enable/disable specification for SIO31
Shift register operation
Serial counter
Port
0
Operation stop
Clear
Port function
Note 1
1
Operation enable
Count operation enable
Serial fu port function
Note 2
MODE1
Transfer operation modes and flags
Operation mode
Transfer start trigger
SO31 output
0
Transmit/transmit and receive mode
Write to SIO31
Normal output
1
Receive-only mode
Read from SIO31
Fixed at low level
SCL311
SCL310
Clock selection
0
0
External clock input to SCK31
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)
Содержание mPD780065 Series
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