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ZGP323H Datasheet(PDF) 56 Page - Zilog, Inc.

Part # ZGP323H
Description  Programmable input glitch filter for pulse reception
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Manufacturer  ZILOG [Zilog, Inc.]
Direct Link  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

ZGP323H Datasheet(HTML) 56 Page - Zilog, Inc.

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ZGP323H
Product Specification
PS023803-0305
Functional Description
48
If D6 of CTR2 Is 1
T16 ignores the subsequent edges in the input signal and continues counting
down. A timeout of T8 causes T16 to capture its current value and generate an
interrupt if enabled (CTR2, D2). In this case, T16 does not reload and continues
counting. If the D6 bit of CTR2 is toggled (by writing a 0 then a 1 to it), T16 cap-
tures and reloads on the next edge (rising, falling, or both depending on CTR1,
D5; D4), continuing to ignore subsequent edges.
This T16 mode generally measures mark time, the length of an active carrier sig-
nal burst.
If T16 reaches 0, T16 continues counting from FFFFh. Meanwhile, a status bit
(CTR2 D5) is set, and an interrupt timeout can be generated if enabled (CTR2
D1).
Ping-Pong Mode
This operation mode is only valid in TRANSMIT Mode. T8 and T16 must be pro-
grammed in Single-Pass mode (CTR0, D6; CTR2, D6), and Ping-Pong mode
must be programmed in CTR1, D3; D2. The user can begin the operation by
enabling either T8 or T16 (CTR0, D7 or CTR2, D7). For example, if T8 is enabled,
T8_OUT is set to this initial value (CTR1, D1). According to T8_OUT's level,
TC8H or TC8L is loaded into T8. After the terminal count is reached, T8 is dis-
abled, and T16 is enabled. T16_OUT then switches to its initial value (CTR1, D0),
data from TC16H and TC16L is loaded, and T16 starts to count. After T16 reaches
the terminal count, it stops, T8 is enabled again, repeating the entire cycle. Inter-
rupts can be allowed when T8 or T16 reaches terminal control (CTR0, D1; CTR2,
D1). To stop the ping-pong operation, write 00 to bits D3 and D2 of CTR1. See
Figure 28.
Enabling ping-pong operation while the counter/timers are
running might cause intermittent counter/timer function. Disable
the counter/timers and reset the status flags before instituting
this operation.
Note:


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