z86e72 ZiLOG Semiconductor, z86e72 Datasheet - Page 58

• Manufacturer Part Number: z86e72
• Description: Otp Microcontroller
• Manufacturer: ZiLOG Semiconductor

PS008704-0507
Z8 Data Bus
CTR0 D4, D3
SCLK
Z8 Data Bus
Pos Edge
Neg Edge
Eight-Bit Counter/Timer Circuits
Figure 26
T8 Transmit Mode
When 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
0 and stops, T8_OUT toggles, the time-out status bit (CTR0 D5) is set, and a time-
out interrupt can be generated if it is enabled (CTR0 D1). See
ulo-N Mode, upon reaching terminal count, T8_OUT is toggled, but no interrupt 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).
See
according to the T8_OUT level, and repeats the cycle.
Figure
Select
Clock
shows the 8-bit counter/timer circuits.
Figure 26. Eight-Bit Counter/Timer Circuits
29. This completes one cycle. T8 then loads from TC8H or TC8L
TC8H
Clock
Figure
HI8
27). In Single-Pass Mode (CTR0 D6), T8 counts down to
Counter T8
8-Bit
LO8
TC8L
CTR0 D2
OTP Microcontroller
Figure
CTR0 D1
T8_OUT
28. In Mod-
IRQ4
54