Pin Functions: Table 1.3 gives a concise description of the function of each pin.
Table 1.3 Pin Functions
Pin No.
FP-80A, CP-84,
Type
Symbol
TFP-80C CG-84
I/O Name and Function
Power
VCC
8, 47
19, 60
I
Power: Connected to the power
supply.
Connect both VCC pins to the system
power supply.
VSS
12, 56,
73
2, 4, 23,
24, 41,
64, 70
I
I
Ground: Connected to ground (0 V).
Connect all VSS pins to system ground
(0 V).
Clock
XTAL
2
13
Crystal: Connected to a crystal
oscillator. The crystal frequency should
be the same as the desired system
clock frequency. If an external clock is
input at the EXTAL pin, a reverse-
phase clock should be input at the
XTAL pin.
EXTAL
3
14
I
External crystal: Connected to a
crystal oscillator or external clock. The
frequency of the external clock should
be the same as the desired system
clock frequency. See section 6.2,
Oscillator Circuit, for examples of
connections to a crystal and external
clock.
ø
14
26
O
System clock: Supplies the system
clock to peripheral devices.
System control
RES
STBY
Reset: A low input causes the chip to
reset.
1
7
12
18
I
I
Standby: A transition to the hardware
standby mode (a power-down state)
occurs when a low input is received at
the STBY pin.
Address bus
Data bus
A15 to A0
D7 to D0
48 to 55, 61 to 63,
57 to 64 65 to 69,
71 to 78
O
Address bus: Address output pins.
72 to 65 3, 1,
84 to 79
I/O Data bus: 8-bit bidirectional data bus.
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