R01UH0823EJ0100 Rev.1.00
Page 59 of 1823
Jul 31, 2019
RX23W Group
1. Overview
1.4
Pin Functions
lists the pin functions.
Table 1.4
Pin Functions (1/4)
Classifications
Pin Name
I/O
Description
Power supply
VCC
Input
Power supply pin. Connect it to the system power supply.
VCL
—
Connect this pin to the VSS pin via a 4.7 μF smoothing capacitor used to
stabilize the internal power supply. Place the capacitor close to the pin.
VSS
Input
Ground pin. Connect it to the system power supply (0 V).
VBATT
Input
Backup power pin
Clock
XTAL
Output
Pins for connecting a crystal. An external clock can be input through the
EXTAL pin.
EXTAL
Input
XCIN
Input
Input/output pins for the sub-clock oscillator. Connect a crystal between
XCIN and XCOUT.
XCOUT
Output
CLKOUT_RF
Output
Bluetooth-dedicated clock output pin for output of a 1-, 2-, or 4-MHz signal
XTAL1_RF
Input
Pins for connecting the Bluetooth-dedicated clock oscillator. Connect a 32-
MHz oscillator to these pins.
XTAL2_RF
Output
CLKOUT
Output Clock output pin.
Operating mode
control
MD
Input
Pin for setting the operating mode. The signal levels on this pin must not
be changed during operation.
UB
Input
Pin used for boot mode (USB interface).
UPSEL
Input
Pin used for boot mode (USB interface).
System control
RES#
Input
Reset pin. This MCU enters the reset state when this signal goes low.
CAC
CACREF
Input
Input pin for the clock frequency accuracy measurement circuit.
On-chip
emulator
FINED
I/O
FINE interface pin.
Interrupts
NMI
Input
Non-maskable interrupt request pin.
IRQ0, IRQ1, IRQ4 to IRQ7
Input
Interrupt request pins.
16-bit timer
pulse unit
TIOCB0
I/O
The TGRB0 inputs capture input/output compare output/PWM output pins.
TIOCB1
I/O
The TGRB1 inputs capture input/output compare output/PWM output pins.
TIOCB2
I/O
The TGRB2 inputs capture input/output compare output/PWM output pins.
TIOCA3, TIOCB3,
TIOCC3, TIOCD3
I/O
The TGRA3 to TGRD3 input capture input/output compare output/PWM
output pins.
TIOCA4, TIOCB4
I/O
The TGRA4 and TGRB4 input capture input/output compare output/PWM
output pins.
TIOCB5
I/O
The TGRB5 inputs capture input/output compare output/PWM output pins.
TCLKA, TCLKB,
TCLKC, TCLKD
Input
Input pins for external clock signals.
Multi-function
timer pulse unit 2
MTIOC0A, MTIOC0B,
MTIOC0C
I/O
The TGRA0 to TGRC0 input capture input/output compare output/PWM
output pins.
MTIOC1A, MTIOC1B
I/O
The TGRA1 and TGRB1 input capture input/output compare output/PWM
output pins.
MTIOC2A, MTIOC2B
I/O
The TGRA2 and TGRB2 input capture input/output compare output/PWM
output pins.
MTIOC3A, MTIOC3B,
MTIOC3C, MTIOC3D
I/O
The TGRA3 to TGRD3 input capture input/output compare output/PWM
output pins.
MTIOC4A, MTIOC4B,
MTIOC4C, MTIOC4D
I/O
The TGRA4 to TGRD4 input capture input/output compare output/PWM
output pins.
MTCLKA, MTCLKB,
MTCLKC, MTCLKD
Input
Input pins for the external clock.