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Table 1-3 Pin Functions (cont)
Type
Symbol
Pin No.
Interrupts
NMI
49
IRQ
to
11,
4
IRQ
72 to 69
0
Address bus
A
to A
,
42 to 31,
19
8
A
to A
29 to 22
7
0
Data bus
D
to D
20 to 13
7
0
AS
Bus control
54
RD
55
WR
56
WAIT
43
16-bit
TCLKD to
76 to 73
integrated
TCLKA
time unit
TIOCA
to
3, 1, 79,
4
(ITU)
TIOCA
77, 75
0
TIOCB
to
4, 2, 80,
4
TIOCB
78, 76
0
TOCXA
5
4
TOCXB
6
4
Programmable TP
to
8 to 1,
15
timing pattern
TP
80 to 73
0
controller (TPC)
I/O
Name and Function
Input
Nonmaskable interrupt: Requests a
nonmaskable interrupt
Input
Interrupt request 4 to 0: Maskable interrupt
request pins
Output Address bus: Outputs address signals
Input/
Data bus: Bidirectional data bus
output
Output Address strobe: Goes low to indicate valid
address output on the address bus
Output Read: Goes low to indicate reading from the
external address space
Output High write: Goes low to indicate writing to the
external address space; indicates valid data on
the data bus.
Input
Wait: Requests insertion of wait states in bus
cycles during access to the external address
space
Input
Clock input A to D: External clock inputs
Input/
Input capture/output compare A4 to A0:
output
GRA4 to GRA0 output compare or input
capture, or PWM output
Input/
Input capture/output compare B4 to B0:
output
GRB4 to GRB0 output compare or input
capture, or PWM output
Output Output compare XA4: PWM output
Output Output compare XB4: PWM output
Output TPC output 15 to 0: Pulse output
11
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