It is possible to use RL78/G13 ports as independent pins. However, please note that although port numbers such as P0 and P13 are defined by a device file, they not are defined up to bit position. Therefore, it is necessary to describe them in the following format.
"Port number" + "." + "bit number"
For example, the assembler statement and C statement for setting bit 0 of P0 to 1 are as follows.
SET1 P0.0 ; Assembler statement example
P0.0 = 1; // C statement example