RL78/G1H CHAPTER 18 RF TRANSCEIVER
R01UH0575EJ0120 Rev. 1.20 Page 546 of 920
Dec 22, 2016
18.2 Pin Functions
18.2.1 Digital pin
This indicates the digital pin of RF unit (RF transceiver).
(1) STANDBY
This is an enable input pin for control of RF unit. Setting to High enables control of RF unit, and Low
disables it and turns the power supply to the RF internal circuit off.
Enable the enable control of this pin along with the reset release of MCU. Accordingly, connect to P130 on
the user board.
(2) XIN, XOUT/REFCLKIN
These are pins for the reference clock of the RF transceiver.
• When connecting to crystal oscillator
Connect the 48-MHz crystal oscillator to XIN and XOUT pins.
• When connecting to external clock
Connect the 48-MHz external clock (square wave) to REFCLKIN pin.
For this connection, connect XIN pin to GND on the board via the 100-pF decoupling capacitor.
(3) INTOUT
This is an interrupt output pin of RF transceiver.
When the interrupt source is generated in RF unit (RF transceiver), INTOUT pin outputs the status
according to the control register setting.
This status signal is connected to INTP3 of MCU in the chip, and MCU can do interrupt processing receiving
the status.
(4) GPIO0/CLKOUT, GPIO1/ANTSELOUT0, GPIO2/ANTSELOUT1, GPIO3, GPIO4/ANTSW
These are 5-bit I/O port pins.
GPIO0 pin also provides the clock output (CLKOUT) function, and the default is GPIO0 pin.
Do not use clock output function in transmit or receive state.
GPIO1 and GPIO2 pins are alternative to switch control function for antenna diversity. The defaults are
GPIO1 and GPIO2 pins.
GPIO4 pin is alternative to ANTSW signal function. The default is GPIO4.
(5) MODE1, MODE2
Connect these pins to GND on the board so that they are fixed to Low.
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