Remote-processing RPC-210 Instrukcja Użytkownika Pobierz pdf (Strona 38)

COUNTER/TIMERS BASIC SECTION 8

Page 8-1

Figure 8-1

INTRODUCTION

COUNTER/TIMERS SECTION 8

There is one counter input and two pulse ouputs

available on the RPC-210. C ounter input consists of

U21 is a counter/quadrature encoder IC. Its accumulator

is 24 bits wide (about 16 million counts). Maxim um

input frequency is 20 MHZ. The counter is software

program med for all of its modes.

If COM1 is not used, a pulse output from the UART

may be used for pulse generation.

The RTC can generate square waves from 2 to 32768

Hz.

These pulses may be used in conjunction with the

counter to measur e a pulse width or provide an alter nate

means of measuring time intervals between two events.

COUNTER/ENCODER

U21 may be programmed as an up/down or quadrature

encoder counter. A preset count may be loaded to

generate an interrupt (INT 0) when the count goes

through 0 or some other number. Counts may be read

“on the fly”.

J11 CONNECTOR PIN OUT

Pin # Description

1 Counter ‘B’ input

2 Counter ‘A’ input

3 Load counter (LCTR)

4 High frequency clock source (CO M1)

5 A-B Gate

6 Ground

7 Carry output

8 INT 0 (to CPU)

9 Borrow output

10 Latched carry or borrow output

PULSE OUTPUTS

A pulse output is available to perform timing functions.

This pulse is generated from the COM 1 UART (U13).

Since the UART is put into test mode, COM1 may not

be used for serial communication when it is generating

pulses.

Available clock outputs are 16X the baud rate. T hus,

pulses from 3.6864 MHZ to 9600 are available.

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 59 60

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