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11.1.3 Pin Configuration
The SCI has the serial pins for each channel as listed in table 11-1.
Table 11-1 SCI Pins
Channel
Name
Abbreviation
I/O
Function
0
Serial clock pin
SCK
0
Input/output
SCI
0
clock input/output
Receive data pin
RxD
0
Input
SCI
0
receive data input
Transmit data pin
TxD
0
Output
SCI
0
transmit data output
1
Serial clock pin
SCK
1
Input/output
SCI
1
clock input/output
Receive data pin
RxD
1
Input
SCI
1
receive data input
Transmit data pin
TxD
1
Output
SCI
1
transmit data output
11.1.4 Register Configuration
The SCI has the internal registers as listed in table 11-2. These registers select asynchronous or
synchronous mode, specify the data format and bit rate, and control the transmitter and receiver
sections.
Table 11-2 Registers
Channel
Address
*
1
Name
Abbreviation
R/W
Initial Value
0
H'FFB0
Serial mode register
SMR
R/W
H'00
H'FFB1
Bit rate register
BRR
R/W
H'FF
H'FFB2
Serial control register
SCR
R/W
H'00
H'FFB3
Transmit data register
TDR
R/W
H'FF
H'FFB4
Serial status register
SSR
R/(W)
*
2
H'84
H'FFB5
Receive data register
RDR
R
H'00
1
H'FFB8
Serial mode register
SMR
R/W
H'00
H'FFB9
Bit rate register
BRR
R/W
H'FF
H'FFBA
Serial control register
SCR
R/W
H'00
H'FFBB
Transmit data register
TDR
R/W
H'FF
H'FFBC
Serial status register
SSR
R/(W)
*
2
H'84
H'FFBD
Receive data register
RDR
R
H'00
Notes: 1. Lower 16 bits of the address.
2. Only 0 can be written to clear flags.