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TABLE 5-3. 28-Pin MCU 1/0 Port Connector J9 Pin Assignments
PIN
SIGNAL
NUMBER
MNEMONIC
1
vss
2
INT*
3-6
NC
7
TIMER
8
PCO
9
PC1
10
PC2
1 1
PC3
12
PBO
13
PB1
14
PB2
1S
PB3
16
PB4
17
PBS
18
PB6
19
PB7
20
PAO
21
PA1
22
PA2
23
PA3
24
PA4
25
PAS
26
PA6
27
PA7
28
NC
EVALUATION MODULE USER'S MANUAL
5-4
SIGNAL NAME AND DESCRIPTION
GROUND
INTERRUPT REQUEST - An input
signal that asynchronously applies an
MCU interrupt.
Not connected.
TIMER - Input mode, serves as timer
clock. Output mode, reflects contents of
DOUT bit of timer status and control
register each time TMZ bit has a low to
high transition.
PORT C (bits 0-3) - General purpose 1/0
lines controlled by software via data
direction registers.
PORT B (bits 0-7) - General purpose 1/0
lines controlled by software via data
direction registers.
PORT A (bits 0-7) - General purpose 1/0
lines controlled by software via data
direction registers.
Not connected.
MOTOROLA
M68705EVM
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