z8f1601 ZiLOG Semiconductor, z8f1601 Datasheet - Page 81
z8f1601
Manufacturer Part Number
z8f1601
Description
Z8 Encore!? Microcontroller With Flash Memory And 10-bit A/d Converter
Manufacturer
ZiLOG Semiconductor
Datasheet
1.Z8F1601.pdf
(246 pages)
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PS017609-0803
Capture Elapsed Time (s)
Timer Input signal. When the Capture event occurs, an interrupt is generated and the timer
continues counting.
The timer continues counting up to the 16-bit Reload value stored in the Timer Reload
High and Low Byte registers. Upon reaching the Reload value, the timer generates an
interrupt and continues counting.
The steps for configuring a timer for Capture mode and initiating the count are as follows:
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 Reload value.
4. Clear the Timer PWM High and Low Byte registers to 0000H . This allows user
5. If desired, enable the timer interrupt and set the timer interrupt priority by writing to
6. Configure the associated GPIO port pin for the Timer Input alternate function.
7. Write to the Timer Control register to enable the timer and initiate counting.
In Capture mode, the elapsed time from timer start to Capture event can be calculated
using the following equation:
Compare Mode
In Compare mode, the timer counts up to the 16-bit maximum Compare value stored in the
Timer Reload High and Low Byte registers. The timer input is the system clock. Upon
reaching the Compare value, the timer generates an interrupt and counting continues (the
timer value is not reset to
the Timer Output pin changes state (from Low to High or from High to Low) upon Com-
pare.
–
–
–
–
(typically
software to determine if interrupts were generated by either a capture event or a
reload. If the PWM High and Low Byte registers still contain 0000H after the
interrupt, then the interrupt was generated by a Reload.
the relevant interrupt registers.
Disable the timer
Configure the timer for Capture mode.
Set the prescale value.
Set the Capture edge (rising or falling) for the Timer Input.
0001H
).
0001H
=
(
---------------------------------------------------------------------------------------------------------
Capture Value Start Value
). Also, if the Timer Output alternate function is enabled,
System Clock Frequency (Hz)
Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
–
) Prescale
´
Z8 Encore!
Timers
®
63
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