RL78/G13 CHAPTER 4 PORT FUNCTIONS
R01UH0146EJ0100 Rev.1.00 239
Sep 22, 2011
4.2.14 Port 13
P130 is a 1-bit output-only port with an output latch.
P137 is a 1-bit input-only port.
P130 is fixed an output port, and P137 is fixed an input ports.
This port can also be used for external interrupt request input.
Table 4-17. Settings of Registers When Using Port 13
Pin Name
Name I/O
Alternate Function Setting Remark
P130 Output
−
P137 Input
×
Remark ×: don’t care
Figures 4-55 and 4-56 show block diagrams of port 13.
Figure 4-55. Block Diagram of P130
RD
WR
PORT
P130
P13
Output latch
(P130)
Internal bus
P13: Port register 13
RD: Read signal
WR××: Write signal
Remark When reset is effected, P130 outputs a low level. If P130 is set to output a high level before reset is effected,
the output signal of P130 can be dummy-output as the CPU reset signal.
P130
Set by software
Reset signal
<R>
<R>
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