RL78/G1H CHAPTER 5 PORT FUNCTIONS
R01UH0575EJ0120 Rev. 1.20 Page 70 of 920
Dec 22, 2016
5.2.4 Port 3
Port 3 is an I/O port with an output latch. Port 3 can be set to the input mode or output mode in 1-bit units using
port mode register 3 (PM3). When the P30, P31 pins are used as input ports, use of on-chip pull-up resistors can
be specified by pull-up resistor option register 3 (PU3).
This port can also be used for external interrupt request input.
Reset signal generation sets port 3 to input port.
P30 pin is used for internal connection between the MCU and RF transceiver. For details, see CHAPTER 2
CONNECTION BETWEEN MCU AND RF TRANSCEIVER. .
5.2.5 Port 4
Port 4 is an I/O port with an output latch. Port 4 can be set to the input mode or output mode in 1-bit units using
port mode register 4 (PM4). When the P40 pin is used as an input port, use of an on-chip pull-up resistor can be
specified by pull-up resistor option register 4 (PU4).
This port can also be used for data I/O for a flash memory programmer/debugger.
Reset signal generation sets port 4 to input port.
5.2.6 Port 6
Port 6 is an I/O port with an output latch. Port 6 can be set to the input mode or output mode in 1-bit units using
port mode register 6 (PM6).
The output of the P60 to P63 pins is N-ch open-drain output (6 V tolerance).
This port can also be used for serial interface data I/O and clock I/O.
Reset signal generation sets port 6 to input port.
5.2.7 Port 7
Port 7 is an I/O port with an output latch. Port 7 can be set to the input mode or output mode in 1-bit units using
port mode register 7 (PM7). When used as an input port, use of an on-chip pull-up resistor can be specified in 1-
bit units by pull-up resistor option register 7 (PU7).
Output from the P71 pin can be specified as N-ch open-drain output (V
DD tolerance) using port output mode
register 7 (POM7).
This port can also be used for serial interface data I/O, clock I/O, and external interrupt request input.
Reset signal generation sets port 7 to input port.
5.2.8 Port 8
Port 8 is an I/O port with an output latch. Port 8 can be set to the input mode or output mode in 1-bit units using
port mode register 8 (PM8). When used as an input port, use of an on-chip pull-up resistor can be specified in 1-
bit units by pull-up resistor option register 8 (PU8).
Input to the P80 and P81 pins can be specified through a normal input buffer or a TTL input buffer in 1-bit units
using port input mode register 8 (PIM8).
Output from the P80 to P82 pin can be specified as N-ch open-drain output (V
DD tolerance) in 1-bit units using
port output mode register 8 (POM8).
Reset signal generation sets port 8 to input port.
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