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1.3.3
Pin Functions
Table 1.2
Pin Functions
Type
Symbol
Power
VCC
supply
VCL
VSS
Clock
XTAL
EXTAL
UXTAL
UEXTAL
UXSEL
φ
EXCL
MD2
Operating
mode control
MD1
RES
System
control
RESO
STBY
FWE
Pin No.
176-Pin
144-Pin
A1, N2,
1, 36, 86,
P9, K12,
120
A11, C5
F3
13
D2, M5,
7, 42, 94,
F13, C13,
110, 141
A3
A2
143
B2
144
A5
B5
D5
D3
5
D3
5
F1
14
D1
9
E4
8
B3
142
E1
12
D6
137
I/O
Name and Function
Input
Power supply pins. Connect all these pins
to the system power supply. Connect the
bypass capacitor between VCC and VSS
(near VCC).
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.
Input
Ground pins. Connect all these pins to the
system power supply (0V).
Input
For connection to a crystal resonator. An
external clock can be supplied from the
Input
EXTAL pin. For an example of crystal
resonator connection, see section 27,
Clock Pulse Generator.
Input
For connection to a crystal resonator for
USB
Input
Input
USB clock source select pin
Output Supplies the system clock to external
devices.
Input
32.768-kHz external clock for sub clock
should be supplied.
Input
These pins set the operating mode.
Inputs at these pins should not be
changed during operation.
Input
Reset pin. When this pin is low, the chip
is reset.
Output Outputs a reset signal to an external
device.
Input
When this pin is low, a transition is made
to hardware standby mode.
Input
Pin for use by flash memory.
Rev. 1.00 Mar. 12, 2008 Page 13 of 1178
Section 1 Overview
REJ09B0403-0100
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