RL78/G13 CHAPTER 4 PORT FUNCTIONS
R01UH0146EJ0100 Rev.1.00 167
Sep 22, 2011
Caution Most of the following descriptions in this chapter use the 128-pin products with the 00H setting in
peripheral I/O redirection register (PIOR) as an example.
4.2.1 Port 0
Port 0 is an I/O port with an output latch. Port 0 can be set to the input mode or output mode in 1-bit units using port
mode register 0 (PM0). When the P00 to P07 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 0 (PU0).
Input to the P01, P03 and P04 pins can be specified through a normal input buffer or a TTL input buffer in 1-bit units
using port input mode register 0 (PIM0).
Output from the P00 and P02 to P04 pins can be specified as N-ch open-drain output (V
DD tolerance) in 1-bit units
using port output mode register 0 (POM0).
Input to the P00 to P03 pins can be specified as analog input or digital input in 1-bit units, using port mode control
register 0 (PMC0).
This port can also be used for timer I/O, A/D converter analog input, serial interface data I/O, and clock I/O.
When reset signal is generated, the following configuration will be set.
· P00 and P01 pins of the 20, 24, 25, 30, and 32-pin products ··· Analog input
· P00, P01 and P04 to P07 pins of the other products ··· Input mode
· P02 and P03 pins of the other products ··· Analog input
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