Rev. 2.00, 09/03, page 17 of 690
1.4
Pin Functions
Table 1.3 lists the pin functions.
Table 1.3
Pin Functions
Classification
Symbol
I/O
Name
Function
Vcc
Power supply
Power supply for the internal
modules and ports for the system.
Connect all Vcc pins to the system
power supply. There will be no
operation if any pins are open.
Vss
Ground
Ground pin. Connect all Vss pins to
the system power supply (0 V).
There will be no operation if any
pins are open.
VccQ
Power supply
Power supply for I/O pins. Connect
all VccQ pins to the system power
supply. There will be no operation
if any pins are open.
Power supply
VssQ
Ground
Ground pin. Connect all VssQ pins
to the system power supply (0 V).
There will be no operation if any
pins are open.
Vcc-PLL1
PLL1 power
supply
Power supply for the on-chip PLL1
oscillator.
Vss-PLL1
PLL1 ground
Ground pin for the on-chip PLL1
oscillator.
Vcc-PLL2
PLL2 power
supply
Power supply for the on-chip PLL2
oscillator.
Vss-PLL2
PLL2 ground
Ground pin for the on-chip PLL2
oscillator.
EXTAL
I
External clock
For connection to a crystal
resonator. An external clock signal
may also be input to the EXTAL
pin.
XTAL
O
Crystal
For connection to a crystal
resonator.
Clock
CKIO
I/O
System clock
Supplies the system clock to
external devices.
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