Z86D99 ZILOG [Zilog, Inc.], Z86D99 Datasheet - Page 53

• Manufacturer Part Number: Z86D99
• Description: Low-Voltage Micro controllers with ADC
• Manufacturer: ZILOG [Zilog, Inc.]

PS003807-1002
Detect
Circuit
Edge
Input
Glitch
Filter
Figure 33. Counter/Timer Architecture
T8 Transmit Mode
Before T8 is enabled, the output of T8 depends on CTR1, D1. If CTR1, D1 is 0,
T8_OUT is 1. If CTR1, D1 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. In single-pass mode (CTR0 D6), T8 counts down to 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). In modulo-N mode, upon reaching
terminal count, T8_OUT is toggled, but no interrupt is generated. Then T8 loads a
new count (if T8_OUT level is 0), TC8L is loaded; if T8_OUT is 1, TC8H is loaded.
TC16H
TC8H
HI16
HI8
8
8
8
8
16-Bit
8-Bit
T16
P
T8
16
R
E
LO8
TC8L
TC16L
LO16
L
8
8
8
8
I
SCLK
M
Z86D990/Z86D991 OTP and Z86L99X ROM
T16 Clocked
I
1 2 4 8
Low-Voltage Microcontrollers with ADC
Divider
Clock
N
A
R
Y
SCLK
And/Or
Logic
T8 Clock Divider
1 2 4 8
Divider
Clock
Timer 16
Timer
8/16
Timer 8
46