MC68HC705J2 Datasheet, PDF(43/82 Page) Freescale Semiconductor, Inc

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MC68HC705J2 Datasheet, PDF (43/82 Pages) Freescale Semiconductor, Inc – member of the low-cost

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Freescale Semiconductor, Inc.

SECTION 7

TIMER

This section describes the operation of the timer and the COP timer. Figure 7-1

shows the organization of the timer system.

LEAST SIGNIFICANT EIGHT BITS OF 15-STAGE RIPPLE COUNTER

Ã·2

INTERNAL PROCESSOR

CLOCK

(XTAL Ã· 2)

FIXED

DIVIDE BY

TIMER COUNTER REGISTER

INTERRUPT CIRCUIT

INTERRUPT REQUEST

TCR $0009

TIMER CONTROL AND STATUS REGISTER

TCSR $0008

RTI RATE SELECT

Ã·2

Ã·2 Ã·2

POWER-ON

RESET (POR)

Ã·2 Ã·2

MOST SIGNIFICANT SEVEN BITS OF 15-STAGE RIPPLE COUNTER

Ã·2 Ã·2 Ã·2

COP TIMER RESET

CLEAR COP TIMER

Figure 7-1. Timer

TIMER

Rev. 2

7-1

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