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10. Serial Communication Interface
Pin Configuration
Table 10.2 shows the SCI1 pin configuration.
Table 10.2 Pin Configuration
Name
SCI1 clock pin
SCI1 data input pin
SCI1 data output pin
Register Configuration
Table 10.3 shows the SCI1 register configuration.
Table 10.3 SCI1 Registers
Name
Serial control register 1
Serial control status register 1
Serial data register U
Serial data register L
10.2.2
Register Descriptions
Serial Control Register 1 (SCR1)
Bit
SNC1
Initial value
Read/Write
R/W
SCR1 is an 8-bit read/write register for selecting the operation mode, the transfer clock source,
and the prescaler division ratio.
Upon reset, SCR1 is initialized to H'00. Writing to this register during a transfer stops the transfer.
Rev.3.00 Jul. 19, 2007 page 252 of 532
REJ09B0397-0300
Abbr.
SCK
1
SI
1
SO
1
Abbr.
SCR1
SCSR1
SDRU
SDRL
7
6
5
⎯
SNC0
0
0
0
R/W
R/W
I/O
Function
I/O
SCI1 clock input or output
Input
SCI1 receive data input
Output
SCI1 transmit data output
R/W
Initial Value
R/W
H'00
R/W
H'80
R/W
Undefined
R/W
Undefined
4
3
⎯
CKS3
CKS2
0
0
R/W
R/W
Address
H'FFA0
H'FFA1
H'FFA2
H'FFA3
2
1
CKS1
CKS0
0
0
R/W
R/W
R/W
0
0
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