Z8F4801AN020SC Zilog, Z8F4801AN020SC Datasheet - Page 82
Z8F4801AN020SC
Manufacturer Part Number
Z8F4801AN020SC
Description
IC ENCORE MCU FLASH 48K 44-LQFP
Manufacturer
Zilog
Series
Encore!®r
Specifications of Z8F4801AN020SC
Core Processor
Z8
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, IrDA, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number Of I /o
31
Program Memory Size
48KB (48K x 8)
Program Memory Type
FLASH
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
44-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Other names
269-3142
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PS017610-0404
If the Timer reaches
The steps for configuring a timer for Compare mode and initiating the count are as fol-
lows:
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. 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 Compare mode, the system clock always provides the timer input. The Compare time is
given by the following equation:
Gated Mode
In Gated mode, the timer counts only when the Timer Input signal is in its active state
(asserted), as determined by the TPOL bit in the Timer Control register. When the Timer
Input signal is asserted, counting begins. A timer interrupt is generated when the Timer
Input signal is deasserted or a timer reload occurs. To determine if a Timer Input signal
deassertion generated the interrupt, read the associated GPIO input value and compare to
the value stored in the TPOL bit.
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. When reaching the Reload value, the
timer generates an interrupt, the count value in the Timer High and Low Byte registers is
reset to
Also, if the Timer Output alternate function is enabled, the Timer Output pin changes state
(from Low to High or from High to Low) at timer reset.
The steps for configuring a timer for Gated mode and initiating the count are as follows:
1. Write to the Timer Control register to:
Compare Mode Time (s)
–
–
–
–
the relevant interrupt registers.
Timer Output alternate function.
–
0001H
Disable the timer
Configure the timer for Compare mode.
Set the prescale value.
Set the initial logic level (High or Low) for the Timer Output alternate function, if
desired.
Disable the timer
and counting resumes (assuming the Timer Input signal is still asserted).
FFFFH
, the timer rolls over to
=
(
----------------------------------------------------------------------------------------------------------- -
Compare Value Start Value
System Clock Frequency (Hz)
Z8F640x/Z8F480x/Z8F320x/Z8F240x/Z8F160x
–
0000H
and continue counting.
) Prescale
×
Z8 Encore!
Timers
®
64
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