Z8F08200100KIT Zilog, Z8F08200100KIT Datasheet - Page 90

• Manufacturer Part Number: Z8F08200100KIT
• Description: DEV KIT FOR Z8 ENCORE 4K TO 8K
• Manufacturer: Zilog
• Series: Z8 Encore!®r
• Type: MCUr

Specifications of Z8F08200100KIT

• Contents: Evaluation Board, Cable, Power Supply, Software and Documentation
• Data Bus Width: 8 bit
• Interface Type: RS-485
• Silicon Manufacturer: Zilog
• Core Architecture: Z8 Encore
• Silicon Core Number: Z8F0822SJ020
• Silicon Family Name: XP F0822
• For Use With/related Products: Z8 Encore!™
• For Use With: 269-4661 - KIT ACC ETHERNET SMART CABLE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 269-3183

PS022517-0508
Reading the Timer Count Values
CAPTURE/COMPARE Mode
In CAPTURE/COMPARE mode, the timer begins counting on the first external Timer
Input transition. The required transition (rising edge or falling edge) is set by the TPOL bit
in the Timer Control Register. The timer input is the system clock.
Every subsequent desired transition (after the first) of the Timer Input signal captures the
current count value. The Capture value is written to the Timer PWM High and Low Byte
Registers. When the Capture event occurs, an interrupt is generated, the count value in the
Timer High and Low Byte Registers is reset to
If no Capture event occurs, the timer counts up to the 16-bit Compare value stored in the
Timer Reload High and Low Byte registers. Upon reaching the Compare value, the timer
generates an interrupt, the count value in the Timer High and Low Byte Registers is reset
to
Follow the steps below for configuring a timer for CAPTURE/COMPARE mode and initi-
ating the count:
1. Write to the Timer Control Register to:
2. Write to the Timer High and Low Byte registers to set the starting count value
3. Write to the Timer Reload High and Low Byte registers to set the Compare value
4. If desired, enable the timer interrupt and set the timer interrupt priority by writing to
5. Configure the associated GPIO port pin for the Timer Input alternate function
6. Write to the Timer Control Register to enable the timer
7. Counting begins on the first appropriate transition of the Timer Input signal.
In CAPTURE/COMPARE mode, the elapsed time from timer start to Capture event is
calculated using the following equation:
The current count value in the timers can be read while counting (enabled). This capability
has no effect on timer operation. When the timer is enabled and the Timer High Byte
Capture Elapsed Time (s)
0001H
–
–
–
–
(typically
the relevant interrupt registers
No interrupt is generated by this first edge
Disable the timer
Configure the timer for CAPTURE/COMPARE mode
Set the prescale value
Set the Capture edge (rising or falling) for the Timer Input
and counting resumes.
0001H
)
=
(
--------------------------------------------------------------------------------------------------------- -
Capture Value Start Value
System Clock Frequency (Hz)
–
0001H
and counting resumes.
Z8 Encore! XP
)xPrescale
Product Specification
®
F0822 Series
Timers
77