68HC05CL48 datasheet(44/145 Pages) MOTOROLA

No. de pieza	68HC05CL48

Descripción Electrónicos	SPECIFICATION (General Release)

PDF	145 Pages

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Fabricante Electrónico	MOTOROLA [Motorola, Inc]

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GENERAL RELEASE SPECIFICATION

June 11, 1997

MOTOROLA

RESETS

MC68HC05CL48

5-2

REV 2.0

5.3

COMPUTER OPERATING PROPERLY RESET (COPR)

The internal COPR reset is generated automatically (if enabled) by a time-out of

the COP Watchdog Timer. This time-out occurs if the counter in the COP

Watchdog Timer is not reset (cleared) within a speciﬁc time by a program reset

sequence. The COP Watchdog Timer can be enabled by setting bit 6 of the Option

feature.

The COP Watchdog reset will activate the internal pulldown device connected to

the RESET pin for one cycle of the internal clock, PH2.

The COP register shares the same address ($FFF0) with the MS byte of the Core

Timer Interrupt Vector as shown below. Reading this location will return the MS

byte of the Core Timer Interrupt Vector. Writing $00 to this location clears the COP

watchdog timer.

76543210

COPR

$FFF0

READ

WRITE

COPR

POR

UUUUUUU

U = UNAFFECTED

68HC05CL48 Datasheet(PDF) 44 Page - Motorola, Inc