RL78/G10 CHAPTER 4 PORT FUNCTIONS
R01UH0384EJ0311 Rev. 3.11 58
Dec 22, 2016
CHAPTER 4 PORT FUNCTIONS
4.1 Port Functions
The RL78 microcontrollers are provided with digital I/O ports, which enable variety of control operations.
In addition to the function as digital I/O ports, these ports have several alternate functions. For details of the alternate
functions, see CHAPTER 2 PIN FUNCTIONS.
4.2 Port Configuration
Ports include the following hardware.
Table 4-1. Port Configuration
Item Configuration
Control registers
Port mode registers 0, 4 (PM0, PM4)
Port registers 0, 4, 12, 13 (P0, P4, P12, P13)
Pull-up resistor option registers 0, 4, 12 (PU0, PU4, PU12)
Port output mode register 0 (POM0)
Port mode control register 0 (PMC0)
Peripheral I/O redirection register (PIOR)
Port • 10-pin products
Total: 8 (CMOS I/O: 6 (N-ch open-drain output (V
DD tolerance): 2), CMOS input: 2)
• 16-pin products
Total: 14 (CMOS I/O: 10 (N-ch open-drain output (V
DD tolerance): 4), CMOS input: 4)
On-chip pull-up resistor • 10-pin products Total: 7
• 16-pin products Total: 11
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