Z86L82 datasheet(54/80 Pages) ZILOG

54 / 80 page

Z86L82/85/88

28-Pin Low-Voltage IR Microcontrollers

PS009007-1202

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. An initial count of

1 is not allowed (a nonfunction occurs).

An initial count of 0 causes TC8 to count from

0 to FFh to FEh.

“h” is used for hexadecimal values.

Transition from 0 to FFh is not a time-out condition.

Do not use the same instructions for stopping the counter/

timers and setting the status bits.

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

TC8H Counts

Counter Enable Command,

T8_OUT switches to its

initial value (CTR1 D1)

T8_OUT toggles

Time-out Interrupt

T8_OUT

TC8L

TC8H

Time-out

Interrupt

Counter Enable Command,

T8_OUT switches to its

initial value (CTR1 D1)

T8_OUT Toggles

TC8L

TC8H

TC8L

Time-out

Interrupt

Note:

Caution:

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