M37470M2 Datasheet, PDF (7/46 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
7470/7471 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Pin
Name
VCC, VSS
AVSS
(Note 1)
RESET
Power source voltage
Analog power
source
Reset input
Input/
Output
Input
XIN
Clock input
Input
XOUT
Clock output
Output
VREF
P00–P07
Reference voltage
input
I/O port P0
Input
I/O
P10–P17
I/O port P1
I/O
P20–P27
(Note 2)
P30–P33
P40–P43
(Note 3)
P50–P53
(Note 4)
I/O port P2
Input port P3
I/O port P4
Input port P5
I/O
Input
I/O
Input
Notes 1 : AVSS for M37471M2/M4/M8/E4/E8-XXXFP.
2 : Only P20–P23 (IN0–IN3) 4-bit for 7470 group.
3 : Only P40 and P41 2-bit for 7470 group.
4 : This port is not included in 7470 group.
Functions
Apply voltage of 2.7 to 5.5 V to VCC, and 0 V to VSS.
Ground level input pin for A-D converter.
Same voltage as VSS is applied.
To enter the reset state, the reset input pin must be kept at “L” for 2 µs or more
(under normal VCC conditions).
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
connected between the XIN and XOUT pins. If an external clock is used, the
clock source should be connected the XIN pin and the XOUT pin should be left
open. Feedback resistor is connected between XIN and XOUT.
Reference voltage input pin for the A-D converter.
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 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. P12, P13 are in common with timer output pins T0, T1, P14, P15,
P16, P17 are in common with serial I/O pins SIN, SOUT, CLK, SRDY, respec-
tively. The output structure of SOUT and SRDY can be changed to N-channel
open drain output.
Port P2 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.
This port is in common with analog input pins IN0–IN7.
Port P3 is a 4-bit input port. P30, P31 are in common with external interrupt
input pins INT0, INT1, and P32, P33 are in common with timer input pins
CNTR0, CNTR1.
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.
Port P5 is a 4-bit input port and pull-up transistor can be connected in units of
4-bit. P50, P51 are in common with input/output pins of clock for clock function
XCIN, XCOUT. When P50, P51 are used as XCIN, XCOUT, connect a ceramic or a
quartz-crystal oscillator between XCIN and XCOUT.
If an external clock input is used, connect the clock input to the XCIN pin and
open the XCOUT pin. Feedback resistor is connected between XCIN and XCOUT
pins.
7