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CHAPTER 14 SERIAL INTERFACE SIO2
Preliminary User’s Manual U14581EJ3V0UM00
14.3 Serial Interface Control Registers
The following three types of registers are used to control the serial interface SIO2.
•
Serial operation mode register 2 (CSIM2)
•
Serial receive data buffer status register (SRBS2)
•
Port mode register 0 (PM0)
(1) Serial operation mode register 2 (CSIM2)
This register is used to set the SIO2 interface’s serial clock, operation mode, and operation enable/disable.
CSIM2 is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input clears CSIM2 to 00H.
Figure 14-2. Serial Operation Mode Register 2 (CSIM2) Format
Address: FF98H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
CSIM2
CSIE2
0
0
CLPH
CLPO
MODE2
SCL21
SCL20
CSIE2
SIO2 Operation Enable/Disable Specification
Shift Register Operation
Serial Counter
Port
0
Operation disabled
Clear
Port function
1
Operation enabled
Counter operation enabled
Serial fu port function
CLPH
SO2 Output Timing Selection
0
Transfer starts at the first active edge of SCK2.
1
Transfer starts when SCK2 is written.
CLPO
Serial Clock Active Level Selection
0
SCK2 is high while serial transfer is stopped.
1
SCK2 is low while serial transfer is stopped.
MODE2
SIO2 Operation Mode Setting
Operation Mode
Transfer Start Trigger
SO2/P04 Pin
0
Transmit/receive mode
Writing to SIO2
SO output
1
Receive-only mode
Reading from SIO2
Port function
SCL21
SCL20
Serial Transfer Operation Clock Selection
Operation Clock (Transfer Frequency)
Master/Slave
0
0
External clock input to SCK2
Slave mode
0
1
f
X
/2
9
Master mode
1
0
f
X
/2
10
Master mode
1
1
f
X
/2
11
Master mode
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