z8f1601 ZiLOG Semiconductor, z8f1601 Datasheet - Page 78
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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Caution:
2. Write to the Timer High and Low Byte registers to set the starting count value (usually
3. Write to the Timer Reload High and Low Byte registers to set the Reload value.
4. If desired, enable the timer interrupt and set the timer interrupt priority by writing to
5. If using the Timer Output function, configure the associated GPIO port pin for the
6. Write to the Timer Control register to enable the timer and initiate counting.
In Continuous mode, the system clock always provides the timer input. The timer period is
given by the following equation:
If an initial starting value other than
registers, the One-Shot mode equation must be used to determine the first time-out period.
Counter Mode
In Counter mode, the timer counts input transitions from a GPIO port pin. The timer input
is taken from the GPIO Port pin Timer Input alternate function. The TPOL bit in the Timer
Control Register selects whether the count occurs on the rising edge or the falling edge of
the Timer Input signal. In Counter mode, the prescaler is disabled.
Upon reaching the Reload value stored in the Timer Reload High and Low Byte registers,
the timer generates an interrupt, the count value in the Timer High and Low Byte registers
is reset to
enabled, the Timer Output pin changes state (from Low to High or from High to Low) at
timer Reload.
The steps for configuring a timer for Counter mode and initiating the count are as follows:
1. Write to the Timer Control register to:
Continuous Mode Time-Out Period (s)
–
0001H ). This only affects the first pass in Continuous mode. After the first timer
Reload in Continuous mode, counting always begins at the reset value of
the relevant interrupt registers.
Timer Output alternate function.
–
–
If using the Timer Output alternate function, set the initial output level (High or
Low).
The input frequency of the Timer Input signal must not exceed one-fourth
the system clock frequency.
Disable the timer
Configure the timer for Counter mode.
0001H
and counting resumes. Also, if the Timer Output alternate function is
0001H
Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
=
is loaded into the Timer High and Low Byte
--------------------------------------------------------------------------- -
System Clock Frequency (Hz)
Reload Value Prescale
´
Z8 Encore!
0001H
Timers
.
®
60
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