Datasheet

Section 1 Overview
Rev. 2.00 Sep. 28, 2009 Page 10 of 870
REJ09B0429-0200
1.3.3 Pin Functions
Table 1.2 Pin Functions
Type Symbol Pin No. I/O Name and Function
VCC 1, 36, 86 Input Power supply pins. Connect all these pins
to the system power supply. Connect the
bypass capacitor between VCC and VSS
(near VCC).
VCL 13 Input External capacitance pin for internal step-
down power. Connect this pin to Vss
through an external capacitor (that is
located near this pin) to stabilize internal
step-down power.
Power supply
VSS 7, 42, 95,
111, 139
Input Ground pins. Connect all these pins to the
system power supply (0V).
XTAL 143 Input
EXTAL 144 Input
For connection to a crystal resonator. An
external clock can be supplied from the
EXTAL pin. For an example of crystal
resonator connection, see section 23,
Clock Pulse Generator.
φ 18 Output Supplies the system clock to external
devices.
Clock
EXCL 18 Input 32.768-kHz external clock for sub clock
should be supplied.
Operating
mode control
MD2
MD1
MD0
14
9
10
Input These pins set the operating mode. Inputs
at these pins should not be changed during
operation.
RES 8 Input Reset pin. When this pin is low, the chip is
reset.
RESO 142 Output Outputs a reset signal to an external
device.
System
control
STBY 12 Input When this pin is low, a transition is made to
hardware standby mode.
FWE 135 Input Pin for use by flash memory.