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7641

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

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MITSUBISHI MICROCOMPUTERS

7641 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

PIN DESCRIPTION

Table 1 Pin description (1)

Pin

Name

VCC, VSS

Power source

CNVss/VPP CNVss

AVss/AVcc

RESET

XIN

XOUT

Analog power

supply

Reset input

Clock input

Clock output

LPF

Ext. Cap.

USB D+

LPF

3.3 V line power

supply

USB D+

USB D-

USB D-

P00/AB0–

P07/AB7

I/O port P0

P10/AB8–

P17/AB15

I/O port P1

P20/DB0–

P27/DB7

I/O port P2

P30/RDY,

I/O port P3

P31, P32,

(See Remarks.)

P33/DMAOUT,

P34/φ OUT,

P35/SYNCOUT,

P36/WR,

P37/RD

P40/EDMA, I/O port P4

P41/INT0,

P42/INT1,

P43/CNTR0,

P44/CNTR1

P50/XCIN,

P51/TOUT/

XCOUT,

P52/OBF0,

P53/IBF0,

P54/S0,

P55/A0,

P56/R(E),

P57/W(R/W)

I/O port P5

Function

Function except a port function

• Apply 4.15 V – 5.25 V for 5 V version or 3.00 V – 3.60 V for 3 V version to the Vcc pin. Apply 0 V to the

Vss pin.

• This controls the MCU operating mode. Connect this pin to Vss. If connecting this pin to Vcc, the

internal ROM is inhibited. In the flash memory version this pin functions as a VPP power supply input pin.

• These pins are the power supply inputs for analog circuitry.

• Reset input pin for active “L.”

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

oscillation frequency.

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

• Loop filter for the frequency synthesizer.

• Power supply input pin for 3.3 V USB line driver.

• USB D+ voltage signal port. Connect a 27 to 33 Ω (recommended) resistor in series.

• USB D- voltage signal port. Connect a 27 to 33 Ω (recommended) resistor in series.

• 8-bit I/O port.

• CMOS compatible input level.

• CMOS 3-state output structure.

• I/O direction register allows each pin to be individually programmed as either input or output.

• When connecting an external memory, these function as the address bus.

• 8-bit I/O port.

• CMOS compatible input level.

• CMOS 3-state output structure.

• I/O direction register allows each pin to be individually programmed as either input or output.

• When connecting an external memory, these function as the address bus.

• 8-bit I/O port.

• CMOS compatible input level or VIHL input level.

• CMOS 3-state output structure.

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

programmed as either input or output.

• When connecting an external memory, these function as

the data bus.

• Key-on wake-up interrupt input pin

• 8-bit I/O port.

• CMOS compatible input level.

• CMOS 3-state output structure.

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

programmed as either input or output.

• When connecting an external memory, these function as

the control bus.

• External memory control pin

• 8-bit I/O port.

• CMOS compatible input level.

• CMOS 3-state output structure.

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

programmed as either input or output.

• When connecting an external memory, these function as

the control bus.

• 8-bit I/O port.

• CMOS compatible input level.

• CMOS 3-state output structure.

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

programmed as either input or output.

• When enabling the Master CPU bus interface function,

CMOS or TTL input level can be selected as an input.

• External memory control pin

• External interrupt pin

• Timer X, Timer Y pin

• Sub-clock generating input pin

• Timers 1, 2 pulse output pins

• Sub-clock generating output pin

• Master CPU bus interface pin

4

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