CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
301
10.3.3 Control registers
(1) Clocked serial interface mode registers 0 to 3 (CSIM0 to CSIM3)
These registers specify the basic operation mode of CSI0 to CSI3.
These registers can be read/written in 8- or 1-bit units (however, for bit 5, only reading is possible).
Address
FFFFF088H
7
CTXE0
CSIM0
6
CRXE0
5
CSOT0
4
0
3
0
2
MOD0
1
CLS01
0
CLS00
After reset
00H
FFFFF098H
CTXE1
CSIM1
CRXE1
CSOT1
0
0
MOD1
CLS11
CLS10
00H
FFFFF0A8H
CTXE2
CSIM2
CRXE2
CSOT2
0
0
MOD2
CLS21
CLS20
00H
FFFFF0B8H
CTXE3
CSIM3
CRXE3
CSOT3
0
0
MOD3
CLS31
CLS30
00H
Bit Position
Bit Name
Function
7
CTXEn
CSI Transmit Enable
Specifies the transmit enabled state/disabled state.
0: Transmission disabled state
1: Transmission enabled state
When CTXEn = 0, the impedance of both the SOn and SIn pins becomes high.
6
CRXEn
CSI Receive Enable
Specifies the receive enabled/disabled state.
0: Reception disabled state
1: Reception enabled state
When transmission is enabled (CTXEn = 1) and reception is disabled, if a serial clock is
being input, 0 is input to the shift register.
If reception is disabled (CRXEn = 0) while receiving data, the SIOn register’s contents
become undefined.
5
CSOTn
CSI Status Of Transmission
Shows that a transmit operation is in progress.
Set (1):
Transmit start timing (writing to the SIOn register)
Clear (0):
Transmit end timing (INTCSIn generated)
If set in the transmission enabled state (CTXEn = 1), when the attempt is made to start
serial data transmission, this is used as a means of judging whether or not writing to
serial I/O shift register n (SIOn) is enabled.
2
MODn
Mode
Specifies the operating mode.
0: MSB first
1: LSB first
Remark
n = 0 to 3
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