1.3.3 Pin Functions
Table 1-3 summarizes the pin functions.
Table 1-3 Pin Functions
Type
Symbol
Pin No.
I/O
Name and Function
Power
V
CC
1, 35, 68
Input
Power: For connection to the power supply.
Connect all V
CC
pins to the system power
supply.
V
SS
11, 22, 44, Input
Ground: For connection to ground (0 V).
57, 65, 92
Connect all V
SS
pins to the 0-V system power
supply.
Clock
XTAL
67
Input
For connection to a crystal resonator.
For examples of crystal resonator and external
clock input, see section 19, Clock Pulse
Generator.
EXTAL
66
Input
For connection to a crystal resonator or input of
an external clock signal. For examples of
crystal resonator and external clock input, see
section 19, Clock Pulse Generator.
ø
61
Output System clock: Supplies the system clock to
external devices.
Operating
MD
2
to MD
0
75 to 73
Input
Mode 2 to mode 0: For setting the operating
mode control
mode, as follows. Inputs at these pins must not
be changed during operation.
MD
2
MD
1
MD
0
Operating Mode
0
0
0
—
0
0
1
Mode 1
0
1
0
Mode 2
0
1
1
Mode 3
1
0
0
Mode 4
1
0
1
Mode 5
1
1
0
Mode 6
1
1
1
Mode 7
10
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