M68HC11KA 데이터 시트보기 (PDF) - Motorola => Freescale

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M68HC11KA

8-Bit Microcontroller

Motorola => Freescale 

11 Pulse Accumulator

The MC68HC11KA4/KA2 has an 8-bit counter that can be configured as a simple event counter or for

gated time accumulation. The counter can be read or written at any time.

The port A bit 7 I/O pin can be configured to act as a clock in event counting mode, or as a gate signal

to enable a free-running clock (E divided by 64) to the 8-bit counter in gated time accumulation mode.

CPU Clock

Cycle Time

(E/26)

(E/214)

Selected

Common XTAL Frequencies

Crystal

8.0 MHz

12.0 MHz

(E)

2.0 MHz

3.0 MHz

(1/E)

500 ns

333 ns

Pulse Accumulator (Gated Mode)

1 count —

32.0 µs

21.330 µs

overflow —

8.192 ms

5.461 ms

16.0 MHz

4.0 MHz

250 ns

16.0 µs

4.096 ms

E ÷ 64 CLOCK

(FROM MAIN TIMER)

TMSK2 INT ENABLES

PIN

PA7/

PAI/

OC1

FROM

MAIN TIMER

OC1

FROM

DDRA7

INPUT BUFFER

AND

EDGE DETECTOR

OUTPUT

BUFFER

2:1

MUX

DATA BUS

PACTL CONTROL

PAOVI

PAOVF

PAII

PAIF

1

INTERRUPT

REQUESTS

2

TFLG2 INTERRUPT STATUS

PAI EDGE

PAEN

DISABLE

FLAG SETTING

CLOCK

OVERFLOW

PACNT 8-BIT COUNTER

ENABLE

PAEN

INTERNAL

DATA BUS

Figure 18 Pulse Accumulator System Block Diagram

MC68HC11KA4

MC68HC11KA4TS/D

MOTOROLA

59

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