Renesas RL78 Series

RL78/F13, F14 CHAPTER 4 PORT FUNCTIONS
R01UH0368EJ0210 Rev.2.10 348
Dec 10, 2015
(b) Use as 3 V output port
<1> Pull up externally the pin to be used (on-chip pull-up resistor cannot be used).
In case of UART0: P15
In case of UART1: P12
In case of CSI00: P15, P17
In case of CSI01: P14, P120
In case of CSI10: P10, P12
In case of CSI11: P71, P72
<2> After reset release, the port mode is the input mode (Hi-Z).
<3> Set the output latch of the corresponding port to 1.
<4> Set the corresponding bit of the POM1, POM6, POM7, and POM12 registers to 1 to set the N-ch open-
drain output (EV
DD tolerance) mode.
<5> Set the output mode by manipulating the PM1, PM6, PM7, and PM12 registers.
At this time, the output data is high level, so the pin is in the Hi-Z state.
<6> Communication is started by setting the serial array unit.
(2) Setting procedure when using I/O pins of simplified IIC00, IIC01, IIC10, and IIC11 functions
<1> Externally pull up the pin to be used (on-chip pull-up resistor cannot be used).
In case of simplified IIC00: P16, P17
In case of simplified IIC01: P13, P14
In case of simplified IIC10: P10, P11
In case of simplified IIC11: P70, P71
<2> After reset release, the port mode is the input mode (Hi-Z).
<3> Set the output latch of the corresponding port to 1.
<4> Set the corresponding bit of the POM1 and POM7 registers to 1 to set the N-ch open-drain output (EV
DD
tolerance) mode.
<5> Set the corresponding bit of the PIM1 and PIM7 registers to 1 to switch to the TTL input buffer.
<6> Set the corresponding bit of the PM1 and PM7 registers to the output mode (data I/O is possible in the
output mode).
At this time, the output data is high level, so the pin is in the Hi-Z state.
<7> Enable the operation of the serial array unit and set the mode to the simplified IIC mode.