Datasheet

Section 10 Serial Communication Interface
Rev. 6.00 Aug 04, 2006 page 334 of 680
REJ09B0145-0600
3. Pin Configuration
Table 10.2 shows the SCI1 pin configuration.
Table 10.2 SCI1 Pin Configuration
Name Abbr. 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 Abbr. 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.