M37512FCHP datasheet(3/87 Pages) RENESAS

Part #	M37512FCHP

Description	SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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3 / 87 page

Feb 18, 2005

page 3 of 85

REJ03B0122-0101

7512 Group

PIN DESCRIPTION

Functions

Name

•Apply voltage of 2.5V to Vcc, and 0 V to Vss.

•Apply voltage of 2.5V to AVcc, and 0 V to AVss, ADVss.

•Reference voltage input pin for A/D converters.

•This pin controls the operation mode of the chip.

•Normally connected to VSS.

•Reset input pin for active “L”.

•Input and output pins for the clock generating circuit.

•Connect a ceramic resonator or quartz-crystal oscillator between the XIN and XOUT pins to set

the oscillation frequency.

•When a high-speed RC oscillator is used, leave the XIN pin and XOUT pin open.

•When an external clock is used, connect the clock source to the XIN pin and leave the XOUT

pin open.

•8-bit CMOS I/O port.

•I/O direction register allows each pin to be individually

programmed as either input or output.

•CMOS compatible input level.

•P00 to P07 are CMOS 3-state output structure,

and P10 to P17 are N-channel open-drain structure.

•P10 to P17 (8 bits) are enabled to output large current

for LED drive.

Power source

Table 1 Pin description

Function except a port function

Analog power

source

Analog reference

voltage

CNVSS input

Reset input

Clock input

Clock output

• Serial I/O2 function pin

I/O port P0

• A/D converter input pin /

PWM output pin

•Current integrator and over current detector input pins.

•Connect the sense resistor. Normally connect the ISENS0 to GND.

• A/D converter input pin

• A/D converter input pin /

Over current detector function pin

• Sub-clock generating circuit I/O

pins (connect a resonat or registor

and capacitor)

•8-bit CMOS I/O port.

•I/O direction register allows each pin to be individually

programmed as either input or output.

•CMOS compatible input level, but P22 to P25 can be

switched between CMOS compatible input level or

SMBUS input level in the I2C-BUS interface function.

•P20, P21, P26, P27: CMOS3-state output structure.

•P22 to P25: N-channel open-drain structure.

•6-bit CMOS I/O port with the same function as port P0.

•CMOS compatible input level.

•CMOS 3-state output structure.

•6-bit CMOS I/O port with the same function as port P0.

•CMOS compatible input level.

•P40 to P42, P45 are CMOS 3-state output structure,

and P43 and P44 are N-channel open-drain structure.

I/O port P1

I/O port P2

I/O port P3

I/O port P4

Analog input pin

VCC, VSS

AVCC

AVSS

ADVSS

ADVREF

CNVSS

RESET

XIN

XOUT

P00/SIN2

P01/SOUT2

P02/SCLK2

P03/SRDY2

P04/AN8

P05/AN9

P06/CFETCNT/

AN10

P07/AN11/

PWM1

P10–P17

P20/XCOUT

P21/XCIN

P22/SDA1

P23/SCL1

P24/SDA2/RxD

P25/SCL2/TxD

P26/SCLK

P27/CNTR0/

SRDY1

P30/AN0–

P35/AN5

P40/CNTR1

P41/INT0

P42/INT1

P43/INT2/SCMP2

P44/INT3/PWM0

P45/DFETCNT

ISENS0

ISENS1

• I2C-BUS interface function pins/

Serial I/O1 function pins

• Serial I/O1 function pin

• Serial I/O1 function pin/

Timer X function pin

• I2C-BUS interface function pins

• A/D converter input pin

• Timer Y function pin

• Interrupt input pins

• Interrupt input pin/SCMP2 output pin

• Interrupt input pin/PWM output pin

• Over current detector function pin

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