Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  4   PORT  FUNCTIONS 

R01UH0305EJ0200  Rev.2.00 

 

 

98  

Jul 04, 2013 

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 P06 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 P00, 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 P02 to P04 pins can be specified as N-ch open-drain output (V

DD

 tolera

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 tolerance

) in 1-

bit units using port output mode register 0 (POM0). 

The P02 and P03 pins can be specified as digital input/output or analog 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, clock I/O, and key 

interrupt input. 

When reset signal is generated, the following configuration will be set. 

· P00, P01 and P04 to P06 pins  ···   Input mode 

· P02 and P03 pins  ···   Analog input 

 

Notes 1. 

For 25- to 48-pin products 

 2. 

For 64-pin products 

 

Port 1 is an I/O port with an output latch.  Port 1 can be set to the input mode or output mode in 1-bit units using port 

mode register 1 (PM1).  When the P10 to P16 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 1 (PU1). 

Input to the P10, P11, and P14 to P16 pins can be specified through a normal input buffer or a TTL input buffer in 1-bit 

units using port input mode register 1 (PIM1). 

Output from the P10 to P15 pins can be specified as N-ch open-drain output (V

DD

 tolerance

/EV

DD

 tolerance

) in 1-

bit units using port output mode register 1 (POM1). 

The P10 to P15 pins can be specified as digital input/output or analog input in 1-bit units, using port mode control 

register 1 (PMC1). 

This port can also be used for A/D converter analog input, serial interface data I/O, clock I/O, programming UART I/O, 

timer I/O, and external interrupt request input. 

When reset signal is generated, the following configuration will be set. 

· P10 to P15 pins  ···   Analog input 

· P16 pin  ···   Input mode 

 

Notes 1. 

For 25- to 48-pin products 

 2. 

For 64-pin products 

 

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