10.1.3 Pin configuration
Table 10-1 shows the SCI3 pin configuration.
Table 10-1 Pin Configuration
Name
Abbrev.
I/O
Function
SCI3 clock
SCK
3x
I/O
SCI3 clock input/output
SCI3 receive data input
RXD
3x
Input
SCI3 receive data input
SCI3 transmit data output
TXD
3x
Output
SCI3 transmit data output
10.1.4 Register configuration
Table 10-2 shows the SCI3 register configuration.
Table 10-2 Registers
Name
Abbrev.
R/W
Initial Value
Address
Serial mode register
SMR
R/W
H'00
H'FFA8/FF98
Bit rate register
BRR
R/W
H'FF
H'FFA9/FF99
Serial control register 3
SCR3
R/W
H'00
H'FFAA/FF9A
Transmit data register
TDR
R/W
H'FF
H'FFAB/FF9B
Serial data register
SSR
R/W
H'84
H'FFAC/FF9C
Receive data register
RDR
R
H'00
H'FFAD/FF9D
Transmit shift register
TSR
Protected
—
—
Receive shift register
RSR
Protected
—
—
Bit rate counter
BRC
Protected
—
—
Clock stop register 1
CKSTPR1
R/W
H'FF
H'FFFA
Serial port control register
SPCR
R/W
H'C0
H'FF91
10.2 Register Descriptions
10.2.1 Receive shift register (RSR)
RSR is a register used to receive serial data. Serial data input to RSR from the RXD
3x
pin is set in
the order in which it is received, starting from the LSB (bit 0), and converted to parallel data. When
one byte of data is received, it is transferred to RDR automatically.
Bit
Read/Write
7
—
6
—
5
—
4
—
3
—
0
—
2
—
1
—
252