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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

(3) Standard serial I/O Mode

The standard serial I/O mode inputs and outputs the software

commands, addresses and data needed to operate (read, pro-

gram, erase, etc.) the internal flash memory. This I/O is clock

synchronized serial. This mode requires a purpose-specific pe-

ripheral unit.

Table 32 Description of pin function (Flash Memory Standard Serial I/O Mode)

Pin name

VCC,VSS

CNVSS

RESET

XIN

XOUT

AVCC, AVSS

Signal name

I/O

Function

Power supply input

CNVSS

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.

I This controls the MCU operating mode. Connect this pin to VPP (= 4.50 V –

5.25 V

Reset input

I To reset, input “L” level for 20 cycles or longer clocks of φ.

Clock input

Clock output

Connect a ceramic or crystal resonator between the XIN and XOUT pins.

When inputting an externally derived clock, input it from XIN and leave

XOUT open.

Analog power supply input

Apply 4.15 V – 5.25 V for 5 V version or 3.00 V – 3.60 V for 3 V version to

the AVCC pin. Apply 0 V to the AVss pin.

LPF

LPF

O Loop filter for the frequency synthesizer.

Ext.Cap

3.3 V line power supply input I Power supply input pin for 3.3 V USB line driver.

USB D+

USB D+

I/O USB D+ signal port.

USB D-

USB D-

I/O USB D- signal port.

P00 to P07

P10 to P17

I/O port P0

I/O port P1

I/O When these ports are not used, input “L” or “H” level, or leave them open in

output mode.

I/O

P20 to P27

I/O port P2

I/O

P30 to P37

I/O port P3

I/O

P40 to P44

I/O port P4

I/O

P50 to P57

I/O port P5

I/O

P60 to P67

I/O port P6

I/O

P70 to P74

I/O port P7

I/O

P80

BUSY output

O This is a BUSY output pin.

P81

SCLK input

I This is a serial clock input pin.

P 82

SRXD input

I This is a serial data input pin.

P 83

P84 to P87

STXDoutput

I/O port P8

O This is a serial data output pin.

I/O When these ports are not used, input “L” or “H” level, or leave them open in

output mode.

Note: The unused pins LPF, Ext.Cap, USB D+/USB D- require the same treatment as that of in the parallel I/O mode.

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