RX230 Datasheet, PDF (13/177 Pages) Renesas Technology Corp – 54-MHz 32-bit RX MCUs, built-in FPU, 88.56 DMIPS, up to 512-KB flash memory

RX230 Group, RX231 Group
1.4 Pin Functions
Table 1.5 lists the pin functions.
Table 1.5
Pin Functions (1/4)
Classifications Pin Name
Power supply VCC
VCL
Clock
Operating mode
control
System control
CAC
On-chip
emulator
Address bus
Data bus
Multiplexed bus
Bus control
VSS
VBATT
XTAL
EXTAL
BCLK
XCIN
XCOUT
CLKOUT
MD
UB
UPSEL
RES#
CACREF
FINED
A0 to A23
D0 to D15
A0/D0 to A15/D15
RD#
WR#
WR0#, WR1#
BC0#, BC1#
LVD
Interrupts
CS0# to CS3#
WAIT#
ALE
CMPA2
NMI
IRQ0 to IRQ7
1. Overview
I/O
Description
Input
—
Power supply pin. Connect it to the system power supply.
Connect this pin to the VSS pin via the 4.7 μF smoothing capacitor used to
stabilize the internal power supply. Place the capacitor close to the pin.
Input Ground pin. Connect it to the system power supply (0 V).
Input Backup power pin
Output Pins for connecting a crystal. An external clock can be input through the
Input ^{EXTAL pin.}
Output Outputs the external bus clock for external devices.
Input Input/output pins for the sub-clock oscillator. Connect a crystal between
Output ^{XCIN and XCOUT.}
Output Clock output pin.
Input
Pin for setting the operating mode. The signal levels on this pin must not
be changed during operation.
Input Pin used for boot mode (USB interface).
Input Pin used for boot mode (USB interface).
Input Reset pin. This MCU enters the reset state when this signal goes low.
Input Input pin for the clock frequency accuracy measurement circuit.
I/O
FINE interface pin.
Output Output pins for the address.
I/O
Input and output pins for the bidirectional data bus.
I/O
Address/data multiplexed bus
Output Strobe signal which indicates that reading from the external bus interface
space is in progress.
Output Strobe signal which indicates that writing to the external bus interface
space is in progress, in single-write strobe mode.
Output Strobe signals which indicate that either group of data bus pins (D7 to D0,
and D15 to D8) is valid in writing to the external bus interface space, in
byte strobe mode.
Output Strobe signals which indicate that either group of data bus pins (D7 to D0
and D15 to D8) is valid in access to the external bus interface space, in
single-write strobe mode.
Output Select signals for areas 0 to 3.
Input Input pin for wait request signals in access to the external space.
Output Address latch signal when address/data multiplexed bus is selected.
Input Detection target voltage pin for voltage detection 2.
Input Non-maskable interrupt request pin.
Input Interrupt request pins.
R01DS0261EJ0110 Rev.1.10
Oct 30, 2015
Page 13 of 177