MC68HC05K0 Datasheet, PDF(55/154 Page) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

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MC68HC05K0 Datasheet, PDF (55/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

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Freescale Semiconductor, Inc.

Resets

Reset Types

5.3.2 External Reset

An external reset is generated by applying a logic 0 for 1 1/2 tcyc to the

RESET pin. A Schmitt trigger senses the logic level at the RESET pin.

A COP reset or an illegal address reset pulls the RESET pin low for one

internal clock cycle. A low-voltage reset pulls the RESET pin low for as

long as the low-voltage condition exists.

NOTE: To avoid overloading some power supply designs, do not connect the

RESET pin directly to VDD. Use a pullup resistor of 10 kâ¦ or more.

COP WATCHDOG

(MASK OPTION)

LOW-VOLTAGE RESET

(MASK OPTION)

VDD

POWER-ON RESET

ILLEGAL ADDRESS RESET

INTERNAL ADDRESS BUS

RESET

INTERNAL

CLOCK

S

RST

D

RESET

LATCH

R

TO CPU AND

SUBSYSTEMS

Figure 5-1. Reset Sources

MC68HC05K0 â¢ MC68HC05K1 â Rev. 2.0

Resets

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Technical Data

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