7906 datasheet(20/531 Pages) RENESAS

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DESCRIPTION

7906 Group User’s Manual Rev.2.0

1-5

Apply 5 V ± 0.5 V to pin Vcc and 0 V to pin Vss.

This pin switches the operating mode. This is only for the

single-chip mode, so connect this pin to VSS.

The microcomputer is reset when “L” level is input to this pin.

Pins XIN and XOUT are the input and output pins of the clock

generating circuit, respectively. Connect these pins via a

ceramic resonator or a quartz-crystal oscillator. When an

external clock is input, this clock should be input to pin XIN,

and pin XOUT should be left open.

To use the PLL frequency multiplier, be sure to connect this

pin to the filter circuit.

The power source input pin for the A-D converter. Connect this

pin to Vcc.

The power source input pin for the A-D and D-A converters.

Connect this pin to Vss.

This is the reference voltage input pin for the A-D and D-A converters.

P0 is an 8-bit CMOS I/O port and has an I/O direction register.

Each pin can function as an input or output port pin. By

software, these pins can function as I/O pins for serial I/O.

P2 is an 8-bit I/O port with the same function as port P1.

By software, these pins can function as I/O pins for timers

A4 and A9. Also, these pins can function as input pins for

timers B0 to B2, input pins for the external interrupts, or

trigger input pins in the pulse output port mode.

P5 is a 3-bit I/O port with the same function as port P1.

By software, these pins can function as input pins for timers B0

to B2, input pins for external interrupts, or position data input

pins in the three-phrase waveform mode.

P6 is a 6-bit I/O port with the same function as port P1.

By software, these pins can function as I/O pins for timers A0 to

A2, or as motor drive waveform output pins.

P7 is a 5-bit I/O port with the same function as port P1.

By software, these pins can function as input pins for the

A-D converter, output pins for the D-A converter, input pins

for the external interrupts, or trigger input pins in the pulse

output port mode.

This pin has the function to forcibly place port P6 pins in the

input mode (port-output-cutoff function). Also, this pin functions

as an input pin for INT4, and as an input pin for the port-output-

cutoff function in the motor drive waveform output mode.

1.3 Pin description

—

Input

Output

—

Input

I/O

Input

Input/Output

Power source input

MD0

MD1

Reset input

Clock input

Clock output

Filter circuit connection

Analog power source

input

Reference voltage input

I/O port P1

I/O port P2

I/O port P5

I/O port P6

I/O port P7

P6OUTCUT input

Vcc, Vss

MD0

MD1

RESET

XIN

XOUT

VCONT

AVcc

AVss

VREF

P10–P17

P20–P27

P55–P57

P60–P65

P70–P74

P6OUTCUT

1.3 Pin description

Tables 1.3.1 lists the pin description.

Table 1.3.1 Pin description

Name

Function

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