Z8FS040 datasheet(25/56 Pages) ZILOG

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ZMOTION

TM Detection and Control Family

Product Specification

PS028506-1110

PRELIMINARY

PIR Engine Enable Register (ePIR_Enable)

Bit

Field

PIR Enable/Disable Pattern

Control

Read/Write

Address

100H

PIR Enable/Disable Pattern (Bits 0-7)

PIR Enable/Disable Register

Controlled by Application

The PIR Enable Register controls the overall operation of the PIR engine. As an added level of

protection, there is a specific 8 bit enable value and 8 bit disable value. All other values are reserved.

Reading this register returns the last value written. Once enabled, the PIR engine reads the application

controlled Status/Control Register values and sets the engine controlled values to their default state.

To enable the PIR engine, first write the ePIR_ENABLE_PATTERN to the PIR Enable Register then

execute the EPIR_INIT macro.

Pattern

Name

Description

00h

ePIR_DISABLE_PATTERN

Disables all Engine functions, including motion detection.

Used to temporarily or permanently shut down the engine.

11h

ePIR_ENABLE_PATTERN

Enables the PIR engine. All primary engine functions as

configured in Engine Status/Control Registers are enabled.

Confirmation of enabled status is provided through Engine

Disabled bit in Status/Control Register 0.

Table 6 - PIR Software Enable Patterns

PIR Sensitivity Register (ePIR_Sensitivity)

Bit

Field

Sensitivity

Default

Control

Read/Write

Address

101H

Sensitivity (Bits 0-7)

PIR Sensitivity Setting

Controlled by Application

The PIR Sensitivity Register is used to adjust the sensitivity of the PIR engine to target motion. Lower

values produce higher sensitivity to motion with 00h being the most sensitive and FFh being the least

sensitive. The user application should load this register with the appropriate value to give the desired

sensitivity.

Notes:



The setting of this register also affects the range of detection. Lower values increase range and

higher values decrease range.

 Depending on the lens and pyroelectric sensor used, values above 3Fh may result in very limited

detection.

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