![](http://datasheet.mmic.net.cn/280000/HD6433030F_datasheet_16064994/HD6433030F_26.png)
Table 1-3 Pin Functions (cont)
Type
Symbol
Pin No.
I/O
Name and Function
Interrupts
NMI
49
Input
Nonmaskable interrupt:
Requests a
nonmaskable interrupt
IRQ
4
to
IRQ
0
A
19
to A
8
,
A
7
to A
0
D
7
to D
0
11,
72 to 69
Input
Interrupt request 4 to 0:
Maskable interrupt
request pins
Address bus
42 to 31,
29 to 22
Output
Address bus:
Outputs address signals
Data bus
20 to 13
Input/
output
Data bus:
Bidirectional data bus
Bus control
AS
54
Output
Address strobe:
Goes low to indicate valid
address output on the address bus
RD
55
Output
Read:
Goes low to indicate reading from the
external address space
WR
56
Output
High write:
Goes low to indicate writing to the
external address space; indicates valid data on
the data bus.
WAIT
43
Input
Wait:
Requests insertion of wait states in bus
cycles during access to the external address
space
16-bit
integrated
time unit
(ITU)
TCLKD to
TCLKA
76 to 73
Input
Clock input A to D:
External clock inputs
TIOCA
4
to
TIOCA
0
3, 1, 79,
77, 75
Input/
output
Input capture/output compare A4 to A0:
GRA4 to GRA0 output compare or input
capture, or PWM output
TIOCB
4
to
TIOCB
0
4, 2, 80,
78, 76
Input/
output
Input capture/output compare B4 to B0:
GRB4 to GRB0 output compare or input
capture, or PWM output
TOCXA
4
TOCXB
4
TP
15
to
TP
0
5
Output
Output compare XA4:
PWM output
6
Output
Output compare XB4:
PWM output
Programmable
timing pattern
controller (TPC)
8 to 1,
80 to 73
Output
TPC output 15 to 0:
Pulse output
11