244
3. I/O configuration
Table 10-2 shows the SCI1 I/O configuration.
Table 10-2 SCI1 I/O Configuration
Name
Abbrev.
I/O
Function
SCI1 clock
SCK
1
I/O
SCI1 clock input/output
SCI1 data input
SI
1
Input
SCI1 receive data input
SCI1 data output
SO
1
Output
SCI1 transmit data output
4. Register configuration
Table 10-3 shows the SCI1 register configuration.
Table 10-3 Registers
Name
Abbrev.
R/W
Initial Value
Address
Serial control register 1
SCR1
R/W
H'00
H'FFA0
Serial control status register 1
SCSR1
R/W
H'9C
H'FFA1
Serial data register U
SDRU
R/W
Undefined
H'FFA2
Serial data register L
SDRL
R/W
Undefined
H'FFA3
Clock stop register 1
CKSTPR1
R/W
H'FF
H'FFFA
10.2.2
Register Descriptions
1. Serial control register 1 (SCR1)
Bit
Initial value
Read/Write
7
SNC1
0
R/W
6
SNC0
0
R/W
5
MRKON
0
R/W
4
LTCH
0
R/W
3
CKS3
0
R/W
0
CKS0
0
R/W
2
CKS2
0
R/W
1
CKS1
0
R/W
SCR1 is an 8-bit read/write register that controls the operating mode, serial clock source, and
prescaler division ratio.
Upon reset, SCR1 is initialized to H'00. If this register is written to during transfer, transfer will be
halted.
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