Z8F1233QH020SG Zilog, Z8F1233QH020SG Datasheet - Page 95
Z8F1233QH020SG
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
Z8F1233QH020SG
Manufacturer:
Zilog
Quantity:
670
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Watchdog Timer
Operation
Table 55. Watchdog Timer Approximate Time-Out Delays
PS025111-1207
WDT Reload Value
(Hex)
000004
The Watchdog Timer (WDT) protects from corrupted or unreliable software, power faults,
and other system-level problems, which may place the Z8 Encore!
into unsuitable operating states. The features of Watchdog Timer include:
•
•
•
The Watchdog Timer is a re-triggerable one-shot timer that resets or interrupts the Z8
Encore! F0830 Series devices when the WDT reaches its terminal count. The WDT uses a
dedicated on-chip RC oscillator as its clock source. The WDT operates only in two modes:
ON and OFF. Once enabled, it always counts and must be refreshed to prevent a time-out.
Perform an enable by executing the WDT instruction or by setting the WDT_AO Flash
option bit. The WDT_AO bit forces the WDT to operate immediately on reset, even if a
WDT instruction has not been executed.
The Watchdog Timer is a 24-bit reloadable downcounter that uses three 8-bit registers in
the eZ8 CPU register space to set the reload value. The nominal WDT time-out period is
calculated using the following equation:
where the WDT reload value is the 24-bit decimal value given by {WDTU[7:0],
WDTH[7:0], WDTL[7:0]} and the typical Watchdog Timer RC oscillator frequency is 10
KHz. The Watchdog Timer cannot be refreshed after it reaches
reload value must not be set to values below
about approximate time-out delays for the minimum and maximum WDT reload values.
WDT Time-out Period (ms)
On-chip RC oscillator
A selectable time-out response: reset or interrupt
24-bit programmable time-out value
WDT Reload Value
(Decimal)
4
Approximate Time-Out Delay
(with 10 kHz typical WDT oscillator frequency)
Typical
=
WDT Reload Value
------------------------------------------------- -
400 µs
000004H
10
.
Table 55
Z8 Encore!
000002H
Description
Minimum time-out delay
Product Specification
provides information
®
F0830 Series devices
®
. The WDT
F0830 Series
Watchdog Timer
85
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