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ZGP323H Datasheet(PDF) 55 Page - Zilog, Inc.

Part No. ZGP323H
Description  Programmable input glitch filter for pulse reception
Download  107 Pages
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Maker  ZILOG [Zilog, Inc.]
Homepage  http://www.zilog.com
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ZGP323H Datasheet(HTML) 55 Page - Zilog, Inc.

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ZGP323H
Product Specification
PS023803-0305
Functional Description
47
Do not load these registers at the time the values are to be
loaded into the counter/timer to ensure known operation.
An initial count of 1 is not allowed. An initial count of 0
causes T16 to count from 0 to FFFFH to FFFEH. Transition
from 0 to FFFFH is not a timeout condition.
Figure 26. T16_OUT in Single-Pass Mode
Figure 27. T16_OUT in Modulo-N Mode
T16 DEMODULATION Mode
The user must program TC16L and TC16H to FFH. After T16 is enabled, and the
first edge (rising, falling, or both depending on CTR1 D5; D4) is detected, T16
captures HI16 and LO16, reloads, and begins counting.
If D6 of CTR2 Is 0
When a subsequent edge (rising, falling, or both depending on CTR1, D5; D4) is
detected during counting, the current count in T16 is complemented and put into
HI16 and LO16. When data is captured, one of the edge detect status bits (CTR1,
D1; D0) is set, and an interrupt is generated if enabled (CTR2, D2). T16 is loaded
with FFFFH and starts again.
This T16 mode is generally used to measure space time, the length of time
between bursts of carrier signal (marks).
Caution:
TC16H*256+TC16L Counts
“Counter Enable” Command
T16_OUT Switches to Its
Initial Value (CTR1 D0)
T16_OUT Toggles,
Timeout Interrupt
TC16H*256+TC16L
TC16H*256+TC16L
TC16H*256+TC16L
T16_OUT Toggles,
Timeout Interrupt
T16_OUT Toggles,
Timeout Interrupt
“Counter Enable” Command,
T16_OUT Switches to Its
Initial Value (CTR1 D0)
TC16_OUT
.. .


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