Z8FS021 datasheet(29/68 Pages) ZILOG

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PS028806-0315

PIR Engine and API

ZMOTION® Intrusion Detection

Product Specification

PIR Engine and API

The ZMOTION MCU Series is developed upon the Z8 Encore! XP-based Z8F082A MCU

with the added functionality of a motion detection (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. The PIR Engine operates in the background and is controlled and monitored

via 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,

as described below.

Standard API Registers.

These registers include all of the status and control functions

required by most applications. These include sensitivity control, motion detection/direc-

tion status and operational modes.

Advanced API Registers.

These registers provide 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 one-second time base for the PIR Engine

to perform housekeeping 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 via 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 software to execute

these macros at the appropriate time.

EPIR_INIT Macro.

This macro is executed to initialize the PIR Engine after reset. It is nor-

mally 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, then execute this macro. ADC con-

versions are started by this macro.

EPIR_INIT Macro:

PUSHX

LDX

RP, #%E0

CALL

%1FFD

POPX

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