Z8FS040 datasheet(27/56 Pages) ZILOG

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ZMOTION

TM Detection and Control Family

Product Specification

PS028506-1110

PRELIMINARY

MD Suspend (Bit 4)

Motion Detection Suspend

Controlled by Application

Temporarily suspends the PIR engine from running. This puts it in a very low processing overhead state

and can be used when the application requires significant CPU processing power. While suspended,

motion detection is disabled, however to ensure fast recovery from this mode, ADC interrupts still occur

and samples continue to be buffered. When the application clears this bit, suspend mode is exited upon

the next ADC interrupt.

0 = Normal Motion Detection

1 = Suspended Motion Detection

Motion Direction Control (Bit 3)

Motion Direction Control Enable

Controlled by Application

This bit enables directional motion detection. The relative direction of the detected motion is indicated in

bit 2 (Motion Direction) of this same register. When configured as a directional detector (bit 3 set to 1),

direction is indicated in bit 2 as positive or negative relative to the PIR sensor.

0 = Standard Motion Detection Mode. Motion detected in any direction. Motion Direction status bit (Bit 2)

is not valid.

1 = Directional Motion Detection Mode. Motion is detected in any direction; relative direction is indicated

via Motion Direction status bit (Bit 2).

The directional polarity of PIR sensors is arbitrary at the time of manufacturing. Therefore it is necessary

for the user application to calibrate to each individual PIR sensor using a controlled target (i.e. moving in

a known direction) and internally record the polarity to identify which polarity represents that direction.

Motion Direction (Bit 2)

Relative Direction of Last Motion Detected

Controlled by PIR engine

When directional motion detection is enabled, this bit indicates the relative direction of the last motion

detected. When the PIR engine sets the Motion Detected bit in PIR Status Register 0, this bit is set or

cleared to indicate the direction of the motion. The status is latched until the user application clears the

Motion Detected bit.

0 = Last detected motion was negative

1 = Last detected motion was positive

This status bit is undefined when Motion Direction Control is disabled.

Motion Detected (Bit 1)

Motion detected on PIR sensor

Set by PIR engine; cleared by application

This bit indicates that the Engine has detected a motion event. The user application should routinely

check this bit to determine if motion has been detected. This bit is set by the Engine and must be

cleared by the user application.

0 = No motion detected by the Engine

1 = Motion has been detected by the Engine

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