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ZGP323H Datasheet(PDF) 54 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) 54 Page - Zilog, Inc.

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ZGP323H
Product Specification
PS023803-0305
Functional Description
46
T16 Transmit Mode
In NORMAL or PING-PONG mode, the output of T16 when not enabled, is depen-
dent on CTR1, D0. If it is a 0, T16_OUT is a 1; if it is a 1, T16_OUT is 0. You can
force the output of T16 to either a 0 or 1 whether it is enabled or not by program-
ming CTR1 D3; D2 to a 10 or 11.
When T16 is enabled, TC16H * 256 + TC16L is loaded, and T16_OUT is switched
to its initial value (CTR1, D0). When T16 counts down to 0, T16_OUT is toggled
(in NORMAL or PING-PONG mode), an interrupt (CTR2, D1) is generated (if
enabled), and a status bit (CTR2, D5) is set. See Figure 25.
Figure 25. 16-Bit Counter/Timer Circuits
Global interrupts override this function as described in
“Interrupts” on page 50.
If T16 is in SINGLE-PASS mode, it is stopped at this point (see Figure 26). If it is
in Modulo-N Mode, it is loaded with TC16H * 256 + TC16L, and the counting con-
tinues (see Figure 27).
You can modify the values in TC16H and TC16L at any time. The new values take
effect when they are loaded.
CTR2 D1
Negative Edge
Positive Edge
Z8® Data Bus
IRQ3
CTR2 D2
SCLK
Z8® Data Bus
CTR2 D4, D3
Clock
T16_OUT
LO16
TC16H
TC16L
Clock
Select
16-Bit
Counter T16
HI16
Note:


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