M30620FCAFP datasheet(605/615 Pages) RENESAS

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Appendix 4

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-288

Appendix 4 A practical example of connecting to the reset IC

M62015 and M62016 are reset ICs compatible with the M16C's backup mode. Here follow these ICs'

overview and characteristics together with an example of connecting to the M16C when Vcc = 3 V.

• Overview of the reset ICs

Either M62015 or M62016 detects the rising edge of the power, the falling edge, and abnormal voltage of

the power of the 3-V family of microcomputer systems. It is an optimal semiconductor integrated circuit to

reset or release the microcomputer system.

Either M62015 or M61016 carries out 2-step power voltage detection, and is provided with two output

terminals (the forced reset signal output RESET and the interrupt handling signal output INT). Either

M62015 or M62016 embeds the BiCMOS process and the low power consumption circuit, and outputs

optimal signals from respective output terminals with low power consumption especially in dealing with a

system that requires its RAM backup.

• Characteristics of the reset ICs

* BiCMOS process low-consumption circuit configuration

Circuit current

Icc = 3

µA (standard value normal mode Vcc = 3.0 V)

Icc = 3

µA (standard value backup mode Vcc = 2.5 V)

* Two-step power voltage detection

Normal power detection

Vs = 2.7 V (standard value)

Power detection for backup

VBATT = 2.0 V (standard value)

* Two outputs

Forced reset signal output

____________

RESET

Interrupt handling signal output

______

INT

* Output form

CMOS output

: M62015

Open drain output

: M62016

• A practical example of connection

INT

RESET

INT

RESET

Interrupt

handling

signal

Forced reset

signal

M62015 / M62016

Smoothing

capacity

100µF

Power for backup

VBATT(+3V)

Power supply

VCC(+3V)

Delay

capacity

0.33µF

Note

Note: Pull-up resistors are necessary only for open drain output form.

VCC

Reset IC

VCC

Power

terminal

Clock signal

input/output

M16C/62A group

INT

Interrupt input

RESET

Reset input

M30620FCAFP Datasheet(PDF) 605 Page - Renesas Technology Corp

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