Datasheet

Section 12 Serial Communication Interface
Rev.7.00 Dec. 24, 2008 Page 367 of 698
REJ09B0074-0700
12.2 Input/Output Pins
Table 12.1 shows the serial pins for each SCI channel.
Table 12.1 Pin Configuration
Channel Pin Name* I/O Function
SCK0 I/O SCI_0 clock input/output
RxD0 Input SCI_0 receive data input
0
TxD0 Output SCI_0 transmit data output
2 SCK2 I/O SCI_2 clock input/output
RxD2 Input SCI_2 receive data input
TxD2 Output SCI_2 transmit data output
Note: * Pin names SCK, RxD, and TxD are used in the text for all channels, omitting the channel
designation.
12.3 Register Descriptions
The SCI has the following registers for each channel. Some bits in the serial mode register (SMR),
serial status register (SSR), and serial control register (SCR) have different functions in different
modes⎯normal serial communication interface mode and smart card interface mode; therefore,
the bits are described separately for each mode in the corresponding register sections.
• Receive shift register (RSR)
• Receive data register (RDR)
• Transmit data register (TDR)
• Transmit shift register (TSR)
• Serial mode register (SMR)
• Serial control register (SCR)
• Serial status register (SSR)
• Smart card mode register (SCMR)
• Serial extended mode register A_0 (SEMRA_0) (only for channel 0)
• Serial extended mode register B_0 (SEMRB_0) (only for channel 0)
• Bit rate register (BRR)