Z8FS040 datasheet(53/56 Pages) ZILOG

53 / 56 page

ZMOTION

TM Detection and Control Family

Product Specification

PS028506-1110

PRELIMINARY

The following flow diagram shows the general S/W operation for Low Scan Rate mode.

Figure 16 - Software Flow Diagram – Low Scan Mode

Set bit 7 of ePIR_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 Scan 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

Z8FS040 Datasheet(PDF) 53 Page - Zilog, Inc.

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