Z86L88 Datasheet, PDF (52/80 Pages) Zilog, Inc. – INFRARED REMOTE CONTROLLERS

Z86L88
Low-Voltage IR Microcontroller
45
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 the terminal count, T8_OUT is toggled, but no
interrupt is generated. From that point, 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.
19-4614; Rev 0; 4/09