Z86L825 Datasheet, PDF (51/79 Pages) Zilog, Inc. – 20-Pin Low-Voltage IR Microcontrollers

Z86L825/826/827
20-Pin Low-Voltage IR Microcontrollers
44
T8 Transmit Mode
Before T8 is enabled, the output of T8 depends on CTR1, D1. If it is 0, T8_OUT is
1. If it is 1, T8_OUT is 0.
When T8 is enabled, the output T8_OUT switches to the initial value (CTR1 D1). If
the initial value (CTR1 D1) is 0, TC8L is loaded; otherwise, TC8H is loaded into
the counter (see Figure 33). In Single-Pass Mode (CTR0 D6), T8 counts down to
0 and stops, T8_OUT toggles, and the time-out status bit (CTR0 D5) is set. A
time-out interrupt can be generated if it is enabled (CTR0 D1). See Figure 34. In
Modulo-N Mode, upon reaching terminal count, T8_OUT is toggled, but no inter-
rupt is generated. Then T8 loads a new count (if the T8_OUT level now is 0),
TC8L is loaded; if it is 1, TC8H is loaded. T8 counts down to 0, toggles T8_OUT,
sets the time-out status bit (CTR0 D5) and generates an interrupt if enabled
(CTR0 D1). One cycle is thus completed. T8 then loads from TC8H or TC8L
according to the T8_OUT level, and repeats the cycle. See Figure 35.
PS008808-1203
PRELIMINARY