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Chapter 41 up/down counter, Overview, Feature – FUJITSU MB91460 SERIES FR60 User Manual

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Chapter 41 Up/Down Counter

1.Overview

Chapter 41 Up/Down Counter

1. Overview

Triggered by an input signal, 16-bit Up/Down Counter counts up or down within the range of 0 to 65535.
Specifically, Up/Down Counter running in the phase difference count mode is suitable for counting the encoder
pulse of motors and other equipment. When encoder's output signals of phase A, phase B and phase Z are
applied, the counter can achieve precise counting of rotation angles or number of revolutions.

2. Feature

• Format: 16 bit length or 8 bit x 2

• Quantity: 2 for 16 bit (Inputs: AIN0/BIN0/ZIN0, AIN2/BIN2/ZIN2)

4 for 8 bit (Inputs: AIN0/BIN0/ZIN0, AIN1/BIN1/ZIN1, AIN2/BIN2/ZIN2, AIN3/BIN3/ZIN3)

• Count mode: Four types

• Timer mode

Count down the internal clock.

• Up/down count mode

Counting up is triggered by an AIN pin signal.

Counting down is triggered by a BIN pin signal.

• Phase difference count mode (Multiply by 2)

Counting is triggered by the rising edge of a BIN pin signal. Up/Down Counter counts up or down,
depending on the AIN pin signal level.

• Phase difference count mode (Multiply by 4)

Counting is triggered by the rising edge of AIN and BIN pin signals. Up/Down Counter counts up or

down, depending on the ZIN pin signal level.

• Count Source

Internal clock (Timer mode): Peripheral clock (CLKP) divided by 2 or 8

External trigger (Up/down count mode): Edge detection (Rising/falling/both edges/no detection)

• Counting range: Any value between 0 and 65535 can be set.

• Interrupt: Select from the following four types:

(1) Compare-match interrupt

(2) Underflow interrupt

(3) Overflow interrupt

(4) Count direction change interrupt

• Others:

Whether counting is performed or not can be controlled based on the pin input level.

The software can activate or deactivate the counter.

The ZIN pin has two functions: Counter clear and gate.

The count direction flag allows identification of the previous count direction.

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A/B/Z

Up/Down Counter

Reload/Compare value

Compare-match

Clear

Underflow

Reload

Selection

Edge detection

Internal clock

External input
A/B/Z