Z8FS040 datasheet(22/56 Pages) ZILOG

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ZMOTION

TM Detection and Control Family

Product Specification

PS028506-1110

PRELIMINARY

Zilog’s PIR Technology and API

General Operation

The ZMOTION

TM MCU Series is based on the Z8 Encore! XP® Z8F082A MCU with the added

functionality of a motion detection engine (PIR engine). The PIR engine is located in the upper 4KB

area of the 8KB device leaving 4KB of code space to the user application. It operates in the

background and is controlled and monitored through an Application Programmer Interface (API). The

API is a series of reserved registers in memory.

There are two sections to the API – Standard API Registers and Advanced API Registers:

1. Standard API registers: It includes all of the status and control functions needs for most

applications. These include sensitivity control, motion detection/direction status and

operational modes.

2. Advanced API registers: It provides additional control over the PIR engine operation and

allows it to be configured to support the pyroelectric sensor and lens being used in the

application.

PIR Engine Timer Tick

Bit 7 of PIR Status/Control Register 1 provides a 1 second time base for the PIR engine to perform

house keeping operations. This bit must be set to 1, once per second by the user application. The bit

is checked and cleared during the EPIR_ADC_ISR routine.

PIR Engine Entry Points

There are two entry points to the PIR engine that are accessed through two predefined Macros. One

is an initialization macro that is used to start the engine and the other is executed upon every ADC

interrupt. Both macros save and initialize the Register Pointer, perform a call to the PIR engine entry

point and then restore the Register Pointer before returning control to the application. It is the

responsibility of the Application S/W to execute these Macro’s at the appropriate time.

EPIR_INIT Macro

This macro is executed to initialize the PIR engine after reset. It is normally only executed once and is

used in conjunction with the PIR Engine Enable register in the standard API section. The application

should initialize all API registers, write the PIR Enable Pattern to the PIR Engine Enable register, and

then execute this Macro. ADC conversions are started by this macro.

EPIR_INIT Macro:

PUSHX

LDX

RP, #%E0

CALL

%1FFD

POPX

CPU Cycles: 261

Peripherals Initialized:

ADC and GPIO depending on API selected options. ADC IRQ set for medium priority.

Z8FS040 Datasheet(PDF) 22 Page - Zilog, Inc.

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