CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ4V0UM
335
10.5.2 CSI4 control registers
CSI4 uses the following type of registers for control functions.
•
Variable-length serial control register 4 (CSIM4)
•
Variable-length serial setting register 4 (CSIB4)
•
Baud rate generator source clock selection register 4 (BRGCN4)
•
Baud rate generator output clock selection register 4 (BRGCK4)
(1) Variable-length serial control register 4 (CSIM4)
This register is used to enable or disable serial interface channel 4’s serial clock, operation modes, and specific
operations.
CSIM4 can be set by an 8-/1-bit memory manipulation instruction.
RESET input clears CSIM4 to 00H.
Figure 10-50. Variable-Length Serial Control Register 4 (CSIM4)
After reset:
00H
R/W
Address: FFFFF2E2H
<7>
6
5
4
3
2
1
0
CSIM4
CSIE4
0
0
0
0
MODE4
0
SCL4
SIO4 operation enable/disable specification
CSIE4
Shift register operation
Serial counter
Port
0
Operation disabled
Clear
Port function
Note 1
1
Operation enabled
Count operation enabled
Serial fu port function
Note 2
Transfer operation mode flag
MODE4
Operation mode
Transfer start trigger
SO4 output
0
Transmit/receive mode
SIO4 write
Normal output
1
Receive-only mode
SIO4 read
Port function
SCL4
Clock selection
0
External clock input (SCK4)
1
BRG (Baud rate generator)
Notes 1.
When CSIE4 = 0 (SIO4 operation disabled status), the port function is available for the SI4, SO4, and
SCK4 pins.
2.
When CSIE4 = 1 (SIO4 operation enable status), the port function is available only for the SI4 pin
when using the transmit function only and to SO4 pin when using the receive function.
Содержание MPD703030A
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