Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 84

• Manufacturer Part Number: Z8F042AHJ020SC00TR
• Description: IC ENCORE XP MCU FLASH 4K 28SSOP
• Manufacturer: Zilog
• Series: Encore!® XP®r

Specifications of Z8F042AHJ020SC00TR

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: IrDA, UART/USART
• Peripherals: Brown-out Detect/Reset, LED, LVD, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 23
• Program Memory Size: 4KB (4K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 28-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Z8F042AHJ020SC00T

PS022825-0908
Caution:
Follow the steps below for configuring a timer for COUNTER mode and initiating 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. This
3. Write to the Timer Reload High and Low Byte registers to set the Reload value.
4. If appropriate, enable the timer interrupt and set the timer interrupt priority by writing
5. Configure the associated GPIO port pin for the Timer Input alternate function.
6. If using the Timer Output function, configure the associated GPIO port pin for the
7. Write to the Timer Control register to enable the timer.
In COUNTER mode, the number of Timer Input transitions since the timer start is given
by the following equation:
COMPARATOR COUNTER Mode
In COMPARATOR COUNTER mode, the timer counts input transitions from the analog
comparator output. The TPOL bit in the Timer Control Register selects whether the count
occurs on the rising edge or the falling edge of the comparator output signal. In COMPAR-
ATOR COUNTER mode, the prescaler is disabled.
After 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 frequency of the comparator output signal must not exceed one-fourth the system
clock frequency. Further, the high or low state of the comparator output signal pulse
must be no less than twice the system clock period. A shorter pulse may not be captured.
–
–
–
only affects the first pass in COUNTER mode. After the first timer Reload in
COUNTER mode, counting always begins at the reset value of
mode the Timer High and Low Byte registers must be written with the value
to the relevant interrupt registers.
Timer Output alternate function.
COUNTER Mode Timer Input Transitions
Disable the timer.
Configure the timer for COUNTER mode.
Select either the rising edge or falling edge of the Timer Input signal for the count.
This selection also sets the initial logic level (High or Low) for the Timer Output
alternate function. However, the Timer Output function is not required to be
enabled.
0001H
and counting resumes. Also, if the Timer Output alternate function is
=
Current Count Value
Z8 Encore! XP
Product Specification
0001H
-
Start Value
®
. In COUNTER
F082A Series
0001H
Timers
.
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