Z86D86 Datasheet, PDF (53/80 Pages) Zilog, Inc. – 28-Pin Low-Voltage OTP Microcontroller

Z86D86
28-Pin Low-Voltage OTP 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 34). 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 35. 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 36.
PS008905-0105
PRELIMINARY