Z8FS021 Datasheet, PDF (51/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

ZMOTION^® Intrusion Detection
Product Specification
43
Table 26 summarizes the maximum Noise Sensitivity values for each window size.
Table 26. Maximum Noise Sensitivity Values
Window Size
Small
Medium
Large
Max PIR Noise Sensitivity
Value
0Ch
1Dh
46h
Typical Value
08h
12h
2D
Bit
Field
Control
Address
Table 27. PIR Signal
(ePIR_Signal)
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PIR Signal
Read
FAH
FBH
PIR Signal (Bits 15–0)
Controlled by the 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.
PS028806-0315
Advanced API Register Set