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ZGP323H Datasheet(PDF) 50 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) 50 Page - Zilog, Inc.

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ZGP323H
Product Specification
PS023803-0305
Functional Description
42
When T8 is enabled, the output T8_OUT switches to the initial value (CTR1, D1).
If the initial value (CTR1, D1) is 0, TC8L is loaded; otherwise, TC8H is loaded into
the counter. In SINGLE-PASS Mode (CTR0, D6), T8 counts down to 0 and stops,
T8_OUT toggles, the timeout status bit (CTR0, D5) is set, and a timeout interrupt
can be generated if it is enabled (CTR0, D1). In Modulo-N Mode, upon reaching
terminal count, T8_OUT is toggled, but no interrupt is generated. From that point,
T8 loads a new count (if the T8_OUT level now is 0), TC8L is loaded; if it is 1,
TC8H is loaded. T8 counts down to 0, toggles T8_OUT, and sets the timeout sta-
tus bit (CTR0, D5), thereby generating an interrupt if enabled (CTR0, D1). One
cycle is thus completed. T8 then loads from TC8H or TC8L according to the
T8_OUT level and repeats the cycle. See Figure 20.
Figure 20. 8-Bit Counter/Timer Circuits
You can modify the values in TC8H or TC8L at any time. The new values take
effect when they are loaded.
To ensure known operation do not write these registers at
the time the values are to be loaded into the counter/timer.
An initial count of 1 is not allowed (a non-function occurs).
An
initial count of 0 causes TC8 to count from 0 to FFH to FEH.
CTR0 D1
Negative Edge
Positive Edge
Z8® Data Bus
IRQ4
CTR0 D2
SCLK
Z8® Data Bus
CTR0 D4, D3
Clock
T8_OUT
LO8
TC8H
TC8L
Clock
Select
8-Bit
Counter T8
HI8
Caution:


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