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