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ZGP323H Datasheet(PDF) 48 Page - Zilog, Inc.

Part No. ZGP323H
Description  Programmable input glitch filter for pulse reception
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Maker  ZILOG [Zilog, Inc.]
Homepage  http://www.zilog.com
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ZGP323H Datasheet(HTML) 48 Page - Zilog, Inc.

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ZGP323H
Product Specification
PS023803-0305
Functional Description
40
Counter/Timer Functional Blocks
Input Circuit
The edge detector monitors the input signal on P31 or P20. Based on CTR1 D5–
D4, a pulse is generated at the Pos Edge or Neg Edge line when an edge is
detected. Glitches in the input signal that have a width less than specified (CTR1
D3, D2) are filtered out (see Figure 18).
Figure 18. Glitch Filter Circuitry
T8 Transmit Mode
Before T8 is enabled, the output of T8 depends on CTR1, D1. If it is 0, T8_OUT is
1; if it is 1, T8_OUT is 0. See Figure 19.
Reserved
---43210
R
W
1
x
Always reads 11111
No Effect
*Indicates the value upon Power-On Reset.
**Indicates the value upon Power-On Reset. Not reset with a Stop Mode recovery.
Table 18. CTR3 (D)03H: T8/T16 Control Register (Continued)
Field
Bit Position
Value
Description
MUX
Glitch
Filter
Edge
Detector
P31
P20
Pos
Edge
Neg
Edge
CTR1
D5,D4
CTR1
D6
CTR1
D3, D2


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