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CHAPTER 20 USART
20.3
USART Pins
This section describes the USART pins and provides a pin block diagram.
■ USART pins
The USART pins are shared with general purpose ports. Table 20.3-1 "USART pins" lists the pin functions,
I/O formats, and settings required to use the USART.
Table 20.3-1 USART pins
Pin name
Pin function
Pxx_i/
Port I/O or serial
SINn
data input
Pyy_j/
Port I/O or serial
SOTn
data output
Pzz_k/
Port I/O or serial
SCKn
clock input/output
474
I/O format
Pull-up
Please refer to
Programmable pull-
CHAPTER 13
up resistor.
"I/O PORTS"for
(refer to
how to select
forCHAPTER 13
available
"I/O PORTS" how
formats
to activate the pull-
up resistor)
MB96300 Super Series Hardware Manual
Standby
Setting required to use pin
control
Provided
Set corresponding general
purpose port to "input":
DDRxx:Di = 0
PIERxx:IEi = 1
Set output enable mode:
(SMRn: SOE = 1)
When a clock is input, then
set corresponding general
purpose port to "input":
DDRzz:Dk = 0
PIERzz:IEk = 1
When a clock is output, then
set output enable mode:
SMRn:SCKE = 1
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