Z8F16800144ZCOG Zilog, Z8F16800144ZCOG Datasheet - Page 320

• Manufacturer Part Number: Z8F16800144ZCOG
• Description: KIT DEV FOR Z8F642 MCU 44 PIN
• Manufacturer: Zilog
• Series: Z8 Encore!®r
• Type: MCUr

Specifications of Z8F16800144ZCOG

• Contents: Hardware, Software and Documentation
• For Use With/related Products: Z8F642
• For Use With: 269-4661 - KIT ACC ETHERNET SMART CABLE
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 269-4678

Table 168. Oscillator Configuration and Selection
PS025011-1010
Clock Source
Internal Precision
RC Oscillator
External Crystal/
Resonator
External 
RC Oscillator
External Clock
Drive
Internal WDT
Oscillator
Caution:
OSC Control Register Unlocking/Locking
To write the oscillator control register (OSCCTL0 and OSCCTL1), unlock it by making
two writes to the OSCCTLx register with the values
the OSCCTLx register changes the value of the actual register and returns the register to a
locked state. Any other sequence of oscillator control register writes has no effect. The
values written to unlock the register must be ordered correctly, but are not necessarily
consecutive. It is possible to write to or read from other registers within the 
unlocking/locking operation.
Unintentional accesses to the oscillator control register can actually stop the chip by
switching to a non-functioning oscillator. To prevent this condition, the oscillator
control block employs a register unlocking/locking scheme.
Characteristics
• Very high accuracy (dependent on
• Selectable frequency 0.0432 MHz,
• ± 4% accuracy when trimmed
• No external components required
• 32 kHz to 20 MHz
• External components required
• 32 kHz to 4 MHz
• Accuracy dependent on external
• 0 to 20 MHz
• Accuracy dependent on external
• 10 kHz nominal
• ± 40% accuracy; no external
• Low power consumption
0.0864 MHz, 0.3456 MHz, 
0.6912 MHz, 1.3824 MHz, 
2.7648 MHz, 5.5296 MHz, and
11.0592 MHz
components
clock source
components required
crystal or resonator used)
P R E L I M I N A R Y
Required Setup
• Unlock and write OSCCTL0 to enable crystal
• Unlock and write Oscillator Control Register
• Configure Flash option bits for correct
• Configure Flash option bits for correct
• Unlock and write OSCCTL0 to enable
• Write GPIO registers to configure PB3 pin
• Unlock and write OSCCTL0 to select
• Apply external clock signal to GPIO
• Enable WDT if not enabled and wait until
• Unlock and write Oscillator Control Register
(OSCCTL0) to enable and select oscillator
frequency.
external oscillator mode
external oscillator mode
(OSCCTL0) to enable and select oscillator
oscillator, wait for it to stabilize and select as
system clock (if the EXTL_AO option bit has
been de-asserted, no waiting is required)
crystal oscillator and select as system clock
for external clock function
external system clock
WDT Oscillator is operating.
E7H
Z8 Encore! XP
followed by
Product Specification
18H
®
. A third write to
Oscillator Control
F1680 Series
306