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Chapter 28 bit search, Overview, Features – FUJITSU MB91460 SERIES FR60 User Manual

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Chapter 28 Bit Search

1.Overview

Chapter 28 Bit Search

1. Overview

The bit search module is used to detect 0, 1 or changing position for data written in specific registers.

2. Features

• Function: Detects the first changing position by scanning data written in data register from MSB to LSB.

• 0 detection

Detects the first ‘0’ changing position.

• 1 detection

Detects the first ‘1’ changing position.

• Changing position detectionDetects the position where data first changes.

• Quantity: 1

• Other: Can read internal data.

(This can be used to restore the previous state when it is used for bit search during interrupt service or
handler.)

0-position register

Detection
circuit
(0-position,
1-pos. and
changing
position)

1-position register

Changing-pos. register

Result register