SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
7542 Group
MITSUBISHI MICROCOMPUTERS
7
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
PIN DESCRIPTION
Table 1 Pin description
Function
Apply voltage of 2.2 to 5.5 V to Vcc, and 0 V to Vss.
Reference voltage input pin for A-D converter.
Chip operating mode control pin, which is always connected to Vss.
Reset input pin for active “L”
Input and output pins for main clock generating circuit.
Connect a ceramic resonator or quartz crystal oscillator between the XIN and XOUT pins.
For using RC oscillator, short between the XIN and XOUT pins, and connect the capacitor and resistor.
If an external clock is used, connect the clock source to the XIN pin and leave the XOUT pin open.
When the ring oscillator is selected as the main clock, connect XIN pin to VCC and leave XOUT open.
Function expect a port function
Name
Power source
(Note 1)
Analog refer-
ence voltage
CNVss
Reset input
Clock input
I/O port P0
I/O port P1
I/O port P2
(Note 2)
I/O port P3
(Note 3)
Pin
Vcc, Vss
VREF
CNVss
RESET
XIN
P00(LED00)/CAP0
P01(LED01)/CMP0
P02(LED02)/CMP1
P03(LED03)/TXOUT
P04(LED04)/RxD2
P05(LED05)/TxD2
P06(LED06)/SCLK2
P07(LED07)/SRDY2
P10/RxD1/CAP0
P11/TxD1
P12/SCLK1
P13/SRDY1
P14/CNTR0
P20/AN0–P27/AN7
P30(LED10)/CAP1
P31(LED11)/CMP2
P32(LED12)/CMP3
P33(LED13)/INT1
P34(LED14)
P35(LED15)
P36(LED16)/INT1
P37(LED17)/INT0
Notes 1: VCC = 2.4 to 5.5 V for the extended operating temperature version and the extended operating temperature 125 °C version.
2: P26/AN6 and P27/AN7 do not exist for the 32-pin version, so that Port P2 is a 6-bit I/O port.
3: P35 and P36/INT1 do not exist for the 32-pin version, so that Port P3 is a 6-bit I/O port.
Capture function pin
Compare function pin
Timer X function pin
Serial I/O2 function pin
Serial I/O1 function pin
Capture function pin
Serial I/O1 function pin
Timer X function pin
Input pins for A-D converter
Capture function pin
Compare function pin
Interrupt input pin
8-bit I/O port.
I/O direction register allows each pin to be individually pro-
grammed as either input or output.
CMOS compatible input level
CMOS 3-state output structure
Whether a built-in pull-up resistor is to be used or not can be
determined by program.
High drive capacity for LED drive port can be selected by program.
5-bit I/O port
I/O direction register allows each pin to be individually pro-
grammed as either input or output.
CMOS compatible input level
CMOS 3-state output structure
CMOS/TTL level can be switched for P10, P12 and P13
8-bit I/O port having almost the same function as P0
CMOS compatible input level
CMOS 3-state output structure
8-bit I/O port
I/O direction register allows each pin to be individually pro-
grammed as either input or output.
CMOS compatible input level (CMOS/TTL level can be
switched for P36 and P37).
CMOS 3-state output structure
Whether a built-in pull-up resistor is to be used or not can be
determined by program.
High drive capacity for LED drive port can be selected by program.
XOUT
Clock output
Key-input
(key-on
wake up
interrupt
input) pin