7480 Datasheet, PDF (10/98 Pages) Bi technologies – 7/8 Diameter 5-Turn Wirewound Precision Potentiometer

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MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
PIN DESCRIPTION
Table 3. Pin description
Pin
VCC, VSS
AVSS
VREF
_____
RESET
XIN
Name
Power source
Analog power
source input
Reference voltage
input
Reset input
Clock input
XOUT
Clock output
P00 – P07
I/O port P0
P10 – P17
P20 – P27
P30 – P33
P40 – P43
P50 – P53
I/O port P1
Input port P2
Input port P3
I/O port P4
I/O port P5
Input/
output
Input
Input
Input
Output
I/O
I/O
Input
Input
I/O
I/O
Functions
Apply a voltage of 2.7 to 5.5 V to VCC and 0 V to VSS.
Ground level input pin for A-D converter. Apply the same voltage as Vss. (This
pin is for 44P6N-A package only.)
Reference voltage input pin for A-D converter. (When the A-D converter is not
used, connect it to VCC.)
Reset input pin active “L”.
These are I/O pins for the internal clock generating circuit of the main clock. To
control the generating frequency, an external ceramic is connected between
the XIN and XOUT pins. If an external clock is used, the clock source should be
connected to the XIN pin, and the XOUT pin should be left open. The feedback
resistor is connected between XIN and XOUT.
8-bit I/O port. The output structure is CMOS output.
When this port is selected for input, pull-up transistors can be connected in
units of 1 bit, and a key-on wake-up function is provided.
8-bit I/O port. The output structure is CMOS output.
When this port is selected for input, pull-up transistors can be connected in
units of 4 bits. P12 and P13 are in common with timer output pins T0 and T1.
_P_1_4,_P15, P16 and P17 are in common with serial I/O pins RXD, TXD, SCLK and
SRDY, respectively.
8-bit input port. (Only 4 bits of P20 to P23 for the 7480 group) or analog input
pins IN0 to IN7 (IN0 to IN3 for the 7480 group).
4-bit input port. P30 and P31 can be configured to serve as external interrupt
input pins INT0 and INT1.
4-bit I/O port. (2 bits of P40 and P41 for the 7480 group). The output structure
is N-channel open drain output, having a built-in clamp diode. P40 and P41 can
be configured to serve as timer I/O pins CNTR0 and CNTR1.
4-bit I/O port. (This port is not included in the 7480 group.) The output structure
is N-channel open drain output, having built-in clamp diodes.
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