14.1.3 Input and Output Pins
Table 14-1 lists the input and output pins used by the SCI module.
Table 14-1 SCI Input/Output Pins
Name Abbreviation I/O Function
Serial clock SCK Input/output Serial clock input and output.
Receive data RXD Input Receive data input.
Transmit data TXD Output Transmit data output.
14.1.4 Register Configuration
Table 14-2 lists the SCI registers.
Table 14-2 SCI Registers
Name Abbreviation R/W Initial Value Address
Receive shift register RSR — — —
Receive data register RDR R H'00 H'FFDD
Transmit shift register TSR — — —
Transmit data register TDR R/W H'FF H'FFDB
Serial mode register SMR R/W H'04 H'FFD8
Serial control register SCR R/W H'0C H'FFDA
Serial status register SSR R/(W)* H'87 H'FFDC
Bit rate register BRR R/W H'FF H'FFD9
* Software can write a “0” to clear the status flag bits, but cannot write a “1.”
14.2 Register Descriptions
14.2.1 Receive Shift Register (RSR)
The RSR receives incoming data bits. When one data character has been received, it is transferred
to the receive data register (RDR).
The CPU cannot read or write the RSR directly.
Bit 76543210
Read/Write ————————
247
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