Z8FS040 datasheet(39/56 Pages) ZILOG

39 / 56 page

ZMOTION

TM Detection and Control Family

Product Specification

PS028506-1110

PRELIMINARY

Medium

1Dh

12h

Large

46h

PIR Signal (ePIR_Signal)

Bit

Field

PIR Signal

Control

Read

Address

FAH

FBH

PIR Signal (Bits 0-15)

Controlled by PIR engine

These registers contain the last PIR signal obtained by the engine. Each time the engine generates a

new PIR signal sample it will place it in these registers and set the New Sample bit in the PIR Advanced

Status/Control 0 Register. This gives the application direct visibility to the PIR generated signal for

debugging purposes.

Note: The 16 bit value provided by these two 8 bit registers must be read as an atomic operation by the

application. This can be ensured by either using the CPU’s ATM instruction or by disabling interrupts

while reading the two 8 bit registers.

PIR DC Signal Level (ePIR_Signal_DC)

Bit

Field

PIR Signal DC

Control

Read

Address

FCH

FDH

PIR Signal DC Level (Bits 0-15)

Controlled by PIR engine

These registers contain the last PIR signal DC Level calculated by the engine. Each time the engine

generates new control limits it will place the DC component level in these registers.

Note: The 16 bit value provided by these two 8 bit registers must be read as an atomic operation by the

application. This can be ensured by either using the CPU’s ATM instruction or by disabling interrupts

while reading the two 8 bit registers.

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