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Z86E72 Datasheet(PDF) 44 Page - Zilog, Inc.

No. de Pieza. Z86E72
Descripción  OTP IR MICROCONTROLLERS
Descarga  74 Pages
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Fabricante  ZILOG [Zilog, Inc.]
Página de inicio  http://www.zilog.com
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Z86E72 Datasheet(HTML) 44 Page - Zilog, Inc.

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Z86E72/E73
OTP IR Microcontrollers
1-44
P R E L I M I N A R Y
DS96LVO1100
COUNTER/TIMER REGISTER DESCRIPTION (Continued)
Ping-Pong Mode
This operation mode is only valid in Transmit Mode. T8
and T16 need to be programmed in Single-Pass Mode
(CTR0 D6, CTR2 D6) and Ping-Pong Mode needs to be
programmed in CTR1 D3, D2. The user can begin the op-
eration 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 disabled and T16 is enabled. T16_OUT
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,
and the whole cycle repeats. Interrupts 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.
Note:
Enabling
Ping-Pong
operation
while
the
counter/timers are running may cause intermittent
counter/timer function. Disable the counter/timers, then
reset the status flags prior to instituting this operation.
To Initiate Ping-Pong Mode
First, make sure both counter/timers are not running. Then
set T8 into Single-Pass Mode (CTR0 D6), set T16 into Sin-
gle-Pass Mode (CTR2 D6), and set Ping-Pong Mode
(CTR1 D2, D3). These instructions do not have to be in
any particular order. Finally, start Ping-Pong Mode by en-
abling either T8 (CTR0 D7) or T16 (CTR2 D7).
During Ping-Pong Mode
The enable bits of T8 and T16 (CTR0 D7, CTR2 D7) will
alternately be set and cleared by hardware. The time-out
bits (CTR0 D5, CTR2 D5) will be set every time the
counter/timers reach the terminal count.
Figure 35. Ping-Pong Mode
Enable
TC8
Time-Out
Enable
TC16
Time-Out
Ping-Pong
CTR1 D3,D2


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