Z86L79 Datasheet, PDF (31/58 Pages) Zilog, Inc. – Low-Voltage Microcontroller

Zilog
Z86L79/80
Low-Voltage Microcontroller
T8 Demodulation Mode
put into LO8, if negative edge, HI8. One of the edge detect
The user should program TC8L and TC8H to %FF. After status bits (CTR1 D1, D0) is set, and an interrupt can be
1 ^{T8 is enabled, when the first edge (rising, falling, or both generated if enabled (CTR0 D2). Meanwhile, T8 is loaded}
depending on CTR1 D5, D4) is detected, it starts to count with %FF and starts counting again. Should T8 reach 0,
down. When a subsequent edge (rising, falling, or both de- the time-out status bit (CTR0 D5) is set, an interrupt can be
pending on CTR1 D5, D4) is detected during counting, the generated if enabled (CTR0 D1), and T8 continues count-
current value of T8 is one's complemented and put into ing from %FF (Figure 22).
one of the capture registers. If it is a positive edge, data is
T8 (8-Bit)
Count Capture
T8_Enable
(Set By User)
No
Yes
Edge Present
No
Yes
Pos
T8 → L08
What Kind Of Edge
Neg
T8 → HI8
%FF → T8
Figure 22. Demodulation Mode Count Capture Flowchart
PRELIMINARY
3-31