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34
7470/7471 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Power source voltage inputs 2.7 to 5.5 V to V
CC
and 0 V to V
SS
.
Ground level input pin for A-D converter. Same voltage as V
SS
is applied.
To enter the reset state, the reset input pin must be kept at a “L” for 2
μ
s or more
(under normal V
CC
conditions).
Connect to V
SS
.
These are I/O pins of internal clock generating circuit for main clock. To control
generating frequency, an external ceramic or a quartz-crystal oscillator is con-
nected between the X
IN
and X
OUT
pins. If an external clock is used, the clock
source should be connected the X
IN
pin and the X
OUT
pin should be left open.
Feedback resistor is connected between X
IN
and X
OUT
.
Reference voltage input pin for the A-D converter.
V
REF
works as CE input.
Port P0 is an 8-bit I/O port. The output structure is CMOS output. When this port
is selected for input, pull-up transistor can be connected in units of 1-bit and a key
on wake up function is provided.
Port P0 works as an 8-bit data bus (D
0
–D
7
).
Port P1 is an 8-bit I/O port. The output structure is CMOS output. When this port
is selected for input, pull-up transistor can be connected in units of 4-bit. P1
2
, P1
3
are in common with timer output pins T
0
, T
1
. P1
4
, P1
5
, P1
6
, P1
7
are in common
with serial I/O pins S
IN
, S
OUT
, CLK, S
RDY
, respectively. The output structure of
S
OUT
and S
RDY
can be changed to N-channel open drain output.
P1
1
–P1
7
works as the 7-bit address input (A
4
–A
10
). P1
0
must be opened.
Port P2 is an 8-bit input port. This port is in common with analog input pins IN
0
–IN
7.
P2
0
–P2
3
works as the lower 4-bit address input (A
0
–A
3
).
P2
4
–P2
7
must be opened.
Port P3 is a 4-bit input port. P3
0
, P3
1
are in common with external interrupt input
pins INT
0
, INT
1
and P3
2
, P3
3
are in common with timer input pins CNTR
0
, CNTR
1
.
P3
0
, P3
1
works as the 2-bit address input (A
11
, A
12
).
P3
2
works as OE input. Connect to P3
3
to V
PP
when programming or verifying.
Port P4 is a 4-bit I/O port. The output structure is CMOS output. When this port is
selected for input, pull-up transistor can be connected in units of 4-bit.
P4
0
, P4
1
works as the higher 2-bit address input (A
13
, A
14
).
P4
2
, P4
3
must be opened.
Port P5 is a 4-bit input port and pull-up transistor can be connected in units of 4-
bit. P5
0
, P5
1
are in common with input/output pins of clock for clock function X
CIN
,
X
COUT
. When P5
0
, P5
1
are used as X
CIN
, X
COUT
, connect a ceramic or a quartz-
crystal oscillator between X
CIN
and X
COUT
. If an external clock input is used, con-
nect the clock input to the X
CIN
pin and open the X
COUT
pin. Feedback resistor is
connected between X
CIN
and X
COUT
pins.
Open.
Power source
Analog power
source
Reset input
Reset input
Clock input
Clock output
Reference
voltage input
Select mode
I/O port P0
Data input/output D
0
–D
7
I/O port P1
Address input A
4
–A
10
I/O port P2
Address input
A
0
–A
3
Input port P3
Address input
A
11
, A
12
Select mode
V
PP
input
I/O port P4
Address input
A
13
, A
14
Input port P5
V
CC
,V
SS
AV
SS
(Note 1)
RESET
X
IN
X
OUT
V
REF
P0
0
–P0
7
P1
0
–P1
7
P2
0
–P2
7
(Note 2)
P3
0
–P3
3
P4
0
–P4
3
(Note 3)
P5
0
–P5
3
(Note 4)
Single-chip
/EPROM
Single-chip
/EPROM
Single-chip
EPROM
Single-chip
/EPROM
Single-chip
EPROM
Single-chip
EPROM
Single-chip
EPROM
Single-chip
EPROM
Single-chip
EPROM
Single-chip
EPROM
Single-chip
EPROM
Input
Input
Output
Input
Input
I/O
I/O
I/O
Input
I/O
Input
Input
Input
I/O
Input
Input
BUILT-IN PROM TYPE MICROCOMPUTERS
PIN DESCRIPTION
Pin
Functions
Mode
Name
Input/
Output
Notes 1 :
AV
SS
for M37471M2/M4/M8/E4/E8-XXXFP.
2 :
Only P2
0
–P2
3
(IN
0
–IN
3
) 4-bit for the 7470 group.
3 :
Only P4
0
and P4
1
2-bit for the 7470 group.
4 :
This port is not included in the 7470 group.