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SH7145F
Asynchronous Serial Data Transmission/Reception
REJ06B0357-0100O/Rev.1.00 March 2004 Page 5 of 17
• Bit Rate Register (BRR_1)
This 8-bit register is used to adjust the bit rate. The SCI has independent baud rate generators
for the individual channels, allowing different bit rates to be set for each. See the hardware
manual for details on setting values, execution rate relationships, etc.
Table 2 shows the function allocations for the task example.
Table 2 Function Allocations
Function Classification Function Allocation
TXD1 Pin Channel 1 transmit data output pin
RXD1 Pin Channel 1 transmit data input pin
SMR_1 SCI1 Sets communication format to asynchronous mode
SCR_1 SCI1 Enables transmit operation
SSR_1 SCI1 Status flag showing SCI1 operation status
SDCR_1 SCI1 Specifies LSB-first
BRR_1 SCI1 Sets communication bit rate
TSR_1 SCI1 Register for transmitting serial data
TDR_1 SCI1 Register for storing transmit data
RSR_1 SCI1 Register for receiving serial data
RDR_1 SCI1 Register for storing receive data