z86l88 ZiLOG Semiconductor, z86l88 Datasheet - Page 54

• Manufacturer Part Number: z86l88
• Description: Low-voltage Ir Microcontroller
• Manufacturer: ZiLOG Semiconductor

PS024102-0804
Caution:
Note:
Figure 34. T8_OUT in Single-Pass Mode
Figure 35. T8_OUT in Modulo-N Mode
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 regis-
ters at the time the values are to be loaded into the counter/timer.
1 is not allowed (a nonfunction occurs).
0 to FFh to FEh.
Transition from 0 to FFh is not a time-out condition.
Two successive commands are necessary. First, the counter/timers must be
stopped. Second, the status bits must be reset. These commands are required
because it takes one counter/timer clock interval for the initiated event to actually
occur.
T8 Demodulation Mode
You need to program TC8L and TC8H to FFh. After T8 is enabled, when the first
edge (rising, falling, or both, depending on CTR1 D5, D4) is detected, it starts to
count down. When a subsequent edge (rising, falling, or both depending on CTR1
D5, D4) is detected during counting, the current value of T8 is complemented and
put into one of the capture registers. If it is a positive edge, data is put into LO8; if
Counter Enable Command,
Counter Enable Command,
T8_OUT switches to its
T8_OUT switches to its
initial value (CTR1 D1)
initial value (CTR1 D1)
“h” is used for hexadecimal values.
Do not use the same instructions for stopping the counter/
timers and setting the status bits.
T8_OUT
T8_OUT Toggles
TC8L
TC8H Counts
TC8H
Time-out
Interrupt
T8_OUT toggles
Time-out Interrupt
An initial count of 0 causes TC8 to count from
TC8L
TC8H
Low-Voltage IR Microcontroller
Time-out
Interrupt
TC8L
An initial count of
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