Renesas F-ZTAT H8 Series, Hardware Manual

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10. Serial Communication Interface
Rev.3.00 Jul. 19, 2007 page 252 of 532
REJ09B0397-0300
Pin Configuration
Table 10.2 shows the SCI1 pin configuration.
Table 10.2 Pin Configuration
Name Abbr. I/O Function
SCI1 clock pin SCK
1
I/O SCI1 clock input or output
SCI1 data input pin SI
1
Input SCI1 receive data input
SCI1 data output pin SO
1
Output SCI1 transmit data output
Register Configuration
Table 10.3 shows the SCI1 register configuration.
Table 10.3 SCI1 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'80 H'FFA1
Serial data register U SDRU R/W Undefined H'FFA2
Serial data register L SDRL R/W Undefined H'FFA3
10.2.2 Register Descriptions
Serial Control Register 1 (SCR1)
Bit 7 6 5 4 3 2 1 0
SNC1 SNC0
⎯ ⎯
CKS3 CKS2 CKS1 CKS0
Initial value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W 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.