z8f0822 ZiLOG Semiconductor, z8f0822 Datasheet - Page 83

• Manufacturer Part Number: z8f0822
• Description: High Performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS022517-0508
System
Control
Clock
Timer
Block
Data
Input
Bus
Timer Operating Modes
The timers are configured to operate in the following modes:
ONE-SHOT Mode
In ONE-SHOT mode, the timer counts up to the 16-bit Reload value stored in the Timer
Reload High and Low Byte registers. The timer input is the system clock. On reaching the
Reload value, the timer generates an interrupt and the count value in the Timer High and
Low Byte registers is reset to
counting.
state for one system clock cycle (from Low to High or vice-versa) on timer Reload.
If it is required for the Timer Output to make a permanent state change on One-Shot
time-out, first set the TPOL bit in the Timer Control Register to the start value before
beginning ONE-SHOT mode. Then, after starting the timer, set TPOL to the opposite bit
value.
Follow the steps below for configuring a timer for ONE-SHOT mode and initiating the
count:
1. Write to the Timer Control Register to:
Also, if the Timer Output alternate function is enabled, the Timer Output pin changes
–
–
Capture
Input
Input
Gate
Disable the timer
Configure the timer for ONE-SHOT mode
PWM / Compare
Reload Register
16-Bit Counter
with Prescaler
Control
16-Bit
16-Bit
Timer
Figure 10. Timer Block Diagram
0001H
. Then, the timer is automatically disabled and stops
Z8 Encore! XP
Timer Block
Timer Output
Interrupt,
Control
PWM,
and
Product Specification
®
F0822 Series
Interrupt
Output
Timer
Timer
Timers
70