Z86L71 datasheet(35/61 Pages) ZILOG

35 / 61 page

Z86L70/71/75/C71

Zilog

IR/Low-Voltage Microcontroller

DS97LVO0500

P R E L I M I N A R Y

1-35

T16 Demodulation Mode

The user should program TC16L and TC16H to %FF. After

T16 is enabled, when the first edge (rising, falling, or both

depending on CTR1 D5, D4) is detected, T16 captures

HI16 and LO16 reloads and begins counting.

If D6 of CTR2 is 0: When a subsequent edge (rising, fall-

ing, or both depending on CTR1 D5, D4) is detected during

counting, the current count in T16 is one's complemented

and put into HI16 and LO16. When data is captured, one

of the edge detect status bits (CTR1 D1, D0) is set and an

interrupt is generated if enabled (CTR2 D2). T16 is loaded

with %FFFF and starts again.

If D6 of CTR2 is 1: T16 ignores the subsequent edges in

the input signal and continues counting down. A time out

of T8 will cause T16 to capture its current value and gen-

erate an interrupt if enabled (CTR2, D2). In this case, T16

does not reload and continues counting. If D6 bit of CTR2

is toggled (by writing a 0 then a 1 to it), T16 will capture and

reload on the next edge (rising, falling, or both depending

on CTR1 D5, D4) but continue to ignore subsequent edg-

es.

Should T16 reach 0, it continues counting from %FFFF;

meanwhile, a status bit (CTR2 D5) is set and an interrupt

time-out can be generated if enabled (CTR2 D1).

Figure 25. T16_OUT in Single-Pass Mode

TC16H*256+TC16L Counts

“Counter Enable” Command,

T16_OUT Switches To Its

Initial Value (CTR1 D0)

T16_OUT Toggles,

Time-Out Interrupt

Figure 26. T16_OUT in Modulo-N Mode

TC16H*256+TC16L

“Counter Enable” Command,

T16_OUT Switches To Its

Initial Value (CTR1 D0)

T16_OUT Toggles,

Time-Out Interrupt

TC16H*256+TC16L

T16_OUT Toggles,

Time-Out Interrupt

T16_OUT

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