Z8F1233QH020SG Zilog, Z8F1233QH020SG Datasheet - Page 153

• 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

Oscillator Control
Operation
Table 93. Oscillator Configuration and Selection
PS025111-1207
Clock Source
Internal precision
RC oscillator
External crystal/
resonator
System Clock Selection
The Z8 Encore!
these is user-selectable.
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•
•
•
•
In addition, Z8 Encore! F0830 Series devices contain clock failure detection and recovery
circuitry, allowing continued operation despite a failure of the primary oscillator.
This chapter discusses the logic used to select the system clock and handle primary
oscillator failures. A description of the specific operation of each oscillator is outlined
further in this document.
The oscillator control block selects from the available clocks.
clock source and its usage.
On-chip precision trimmed RC oscillator
On-chip oscillator using off-chip crystal or resonator
On-chip oscillator using external RC network
External clock drive
On-chip low precision Watchdog Timer Oscillator
Characteristics
• 32.8 kHz or 5.53 MHz
• ± 4% accuracy when trimmed
• No external components required
• 32 kHz to 20 MHz
• Very high accuracy (dependent on
• Requires external components
crystal or resonator used)
®
F0830 Series device uses five possible clocking schemes. Each one of
Required Setup
• Unlock and write oscillator control
• Configure Flash option bits for correct
• Unlock and write OSCCTL to enable
register (OSCCTL) to enable and select
oscillator at either 5.53 MHz or
32.8 kHz
external OSCILLATOR mode
crystal oscillator, wait for it to stabilize
and select as system clock (if the
XTLDIS option bit has been
de-asserted, no waiting is required)
Z8 Encore!
Table 93
Product Specification
describes each
®
Oscillator Control
F0830 Series
143