RL78/G13 CHAPTER 4 PORT FUNCTIONS
R01UH0146EJ0100 Rev.1.00 192
Sep 22, 2011
4.2.5 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 to P47 pins are 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 4 (PU4).
Input to the P43 and P44 pins can be specified through a normal input buffer or a TTL input buffer in 1-bit units using
port input mode register 4 (PIM4).
Output from the P430 to P45 pins can be specified as N-ch open-drain output (V
DD tolerance) in 1-bit units using port
output mode register 4 (POM4).
This port can also be used for data I/O for a flash memory programmer/debugger, timer I/O, serial interface data I/O,
clock I/O, and external interrupt request input.
Reset signal generation sets port 4 to input mode.
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