Z8F1233QH020SG Zilog, Z8F1233QH020SG Datasheet - Page 78

• Manufacturer Part Number: Z8F1233QH020SG
• Description: IC ENCORE XP MCU FLSH 12K 20QFN
• Manufacturer: Zilog
• Series: Encore!®r

Specifications of Z8F1233QH020SG

• Core Processor: Z8
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, LED, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 12KB (12K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• For Use With: 770-1002 - ISP 4PORT ZILOG Z8 ENCORE! MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Other names: 269-4656

PS025111-1207
Caution:
Counter Mode Timer Input Transitions
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 determines whether the count occurs on the rising edge or the falling
edge of the timer input signal. In COUNTER mode, the prescaler is disabled.
On 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.
Follow the steps below for configuring a timer for COUNTER mode and for 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 only
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 timer
7. Write to the timer control register to enable the timer.
In COUNTER mode, the number of timer input transitions is given by the following
equation:
The input frequency of the timer input signal must not exceed one-fourth the system
clock frequency.
–
–
–
affects the first pass in COUNTER mode. After the first timer reload in COUNTER
mode, counting always begins at the reset value
timer high and low byte registers must be written with the value
to the relevant interrupt registers.
output alternate function.
0001H
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.
and counting resumes. Also, if the timer output alternate function is
=
Current Count Value Start Value
0001H
. In COUNTER mode, the
Z8 Encore!
Product Specification
0001H
–
®
F0830 Series
.
Timers
68