Z8FS040 datasheet(31/56 Pages) ZILOG

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ZMOTION

TM Detection and Control Family

Product Specification

PS028506-1110

PRELIMINARY

ANAx Scan Request

Analog Channel 0, 1, 3-7 Scan Requested Bits

Set by Application; cleared by PIR engine

These bits allow the user application to request the Engine to perform an A/D conversion on the non-

reserved analog inputs. When requested, the Engine will reconfigure the appropriate I/O pin to a single-

ended, unbuffered input using a 2 Volt reference. It will then take the next sample and store it in the PIR

ADC Result Value Registers and clear all ANAx Scan Request bits. The I/O configuration for the ANAx

pin is not returned to its previous configuration by the Engine. If needed, the user application must do

this.

If multiple request bits are set simultaneously, the Engine will only scan the lowest numbered ADC

channel requested and ignore any other requests. The user application should set one request bit then

poll it to determine when the conversion is complete and the data is ready.

When ADC Scan requests are being serviced by the PIR engine, ADC conversions on the PIR sensor

are suspended. Therefore the user application should be careful not to continuously request ADC

Scan’s. The Process Rate Register in the “Advanced PIR Engine” section can be monitored to ensure

the Engine is receiving enough time to perform its required PIR Sensor ADC scans.

0 = no conversion requested/last conversion completed

1 = perform a conversion on this channel

PIR ADC Result Value (ePIR_ADC_Result)

Bit

Field

ADC Result Value

Control

Read

Address

10AH

10BH

PIR ADC Result Value (Bits 0-15)

ADC Scan Request Result Value

Controlled by PIR engine

The PIR ADC Result Value contains the result of the last application requested ADC conversion.

The data format is identical to that given in the Z8 Encore XP Product Specification (PS0228) for

registers ADCD_H and ADCD_L.

Example for requesting an ANA0 Conversion:

Set bit 0 (ANA0 Scan Request) in PIR Status/Control Register 3 (ePIR_SC3)

Wait until the ANA0 Scan Request bit is cleared by the Engine

Read the ADC conversion result from the PIR ADC Result Value register

Note: Even though the ADC Result Value is a 16 bit register, atomic operations are not required since

the value is only updated at the request of the application.

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