UPD78F1502AGK-GAK-AX Datasheet, PDF (542/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 14 SERIAL ARRAY UNIT
(2) Operation procedure
Figure 14-69. Initial Setting Procedure for UART Transmission
Starting initial setting
Setting PER0 register
Setting SPSm register
Release the serial array unit from the
reset status and start clock supply.
Set the prescaler.
Setting SMRmn register
Set an operation mode, etc.
Setting SCRmn register
Set a communication format.
Setting SDRmn register
Set a transfer baud rate.
Changing setting of SOLm register
Set an output data level.
Setting SOm register
Changing setting of SOEm register
Setting port
Writing to SSm register
Starting communication
Manipulate the SOmn bit and set an
initial output level.
Set the SOEmn bit to 1 and enable data
output of the target channel.
Enable data output of the target channel
by setting a port register and a port mode
register.
Set the SSmn bit of the target channel to
1 to set SEmn = 1.
Set transmit data to the TXDq register (bits
7 to 0 of the SDRmn register) and start
communication.
Caution After setting the SAUmEN to 1, be sure to set the SPSm register after 4 or more clocks have
elapsed.
R01UH0004EJ0501 Rev.5.01
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Jun 20, 2011