Z8FS021 datasheet(66/68 Pages) ZILOG

부품명	Z8FS021

상세설명	Select from an assortment of lenses and pyroelectric sensors to best fit your application

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66 / 68 page

PS028806-0315

Appendix B. PIR Engine Initialization and Control

ZMOTION® Intrusion Detection

Product Specification

The flow diagram shown in Figure 13 displays the general software operation for Low

Scan Rate mode.

Figure 13. Application Flow Diagram, Normal Scan Rate

Set bit 7 ofePIR_SC1

(Engine Timer Tick)

5 Millisecond

Timer Interrupt

Return

One Second

Timer Tick

Start next ADC

Sample

Execute

EPIR_ADC_ISR

Macro

1 Second?

Yes

5 Millisecond

ADC Scan

Monitor ePIR

API for Events

RESET

Initialize API Registers

Recommended settings supplied in

lens/pyro configuration file

PIR S can Rate = 1

User

Application

Code

Set ePIR_Enable Register to

ePIR_ENABLE_PATTERN

Execute EPIR_INIT Macro

Wait for PIR Sensor Stable

ePIR_SC0:0=1

ePIR

Initialization

Main

Application

Loop

Initialize Flash Frequency Register

Enable ADC in PWRCTL0

Initialize Oscillator & WDT

Set up GPIO’s for application

Set up Timer for 5 Millisecond Interrupt

Enable Global Interrupts

HALT

(Optional)

Application

Initialization

Turn off ADC to

Conserve Power

Enter ADC

Interrupt

Exit ADC

Interrupt

ADC

Interrupt

Z8FS021 데이터시트(PDF) 66 Page - Zilog, Inc.

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