7470 Datasheet, PDF (35/47 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
7470/7471 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
BUILT-IN PROM TYPE MICROCOMPUTERS
PIN DESCRIPTION
Pin
Mode
Name
Input/
Output
Functions
VCC,VSS
Single-chip Power source
/EPROM
Power source voltage inputs 2.7 to 5.5 V to VCC and 0 V to VSS.
AVSS
(Note 1)
Single-chip Analog power
/EPROM source
Ground level input pin for A-D converter. Same voltage as VSS is applied.
RESET
Single-chip Reset input
Input To enter the reset state, the reset input pin must be kept at a “L” for 2 µs or more
(under normal VCC conditions).
EPROM Reset input
Connect to VSS.
XIN
XOUT
Single-chip Clock input
/EPROM
Clock output
Input
Output
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 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.
VREF
Single-chip Reference
voltage input
Input Reference voltage input pin for the A-D converter.
EPROM Select mode
Input VREF works as CE input.
P00–P07 Single-chip I/O port P0
I/O 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.
EPROM Data input/output D0–D7 I/O Port P0 works as an 8-bit data bus (D0–D7).
P10–P17 Single-chip I/O port P1
I/O 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, respectively. The output structure of
SOUT and SRDY can be changed to N-channel open drain output.
EPROM Address input A4–A10 Input P11–P17 works as the 7-bit address input (A4–A10). P10 must be opened.
P20–P27
(Note 2)
Single-chip I/O port P2
EPROM Address input
A0–A3
I/O Port P2 is an 8-bit input port. This port is in common with analog input pins IN0–IN7.
Input P20–P23 works as the lower 4-bit address input (A0–A3).
P24–P27 must be opened.
P30–P33 Single-chip Input port P3
Input 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.
EPROM
Address input
A11, A12
Select mode
VPP input
Input P30, P31 works as the 2-bit address input (A11, A12).
P32 works as OE input. Connect to P33 to VPP when programming or verifying.
P40–P43
(Note 3)
Single-chip I/O port P4
I/O 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.
EPROM Address input
A13, A14
Input P40, P41 works as the higher 2-bit address input (A13, A14).
P42, P43 must be opened.
P50–P53
(Note 4)
Single-chip Input port P5
Input
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, con-
nect the clock input to the XCIN pin and open the XCOUT pin. Feedback resistor is
connected between XCIN and XCOUT pins.
EPROM
Notes 1 : AVSS for M37471M2/M4/M8/E4/E8-XXXFP.
2 : Only P20–P23 (IN0–IN3) 4-bit for the 7470 group.
3 : Only P40 and P41 2-bit for the 7470 group.
4 : This port is not included in the 7470 group.
Open.
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