Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 204

• 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

Crystal Oscillator
Operating Modes
Crystal Oscillator Operation
PS022825-0908
Note:
Note:
The products in the Z8 Encore! XP
oscillator for use with external crystals with 32 kHz to 20 MHz frequencies. In addition,
the oscillator supports external RC networks with oscillation frequencies up to 4 MHz or
ceramic resonators with frequencies up to 8 MHz. The on-chip crystal oscillator can be
used to generate the primary system clock for the internal eZ8 CPU and the majority of the
on-chip peripherals. Alternatively, the X
input signal (32 kHz–20 MHz). If an external clock generator is used, the X
be left unconnected. The Z8 Encore! XP F082A Series products do not contain an internal
clock divider. The frequency of the signal on the X
frequency of the system clock.
Although the XIN pin can be used as an input for an external clock generator, the CLKIN
pin is better suited for such use (see
The Z8 Encore! XP F082A Series products support four oscillator modes:
•
•
•
•
The oscillator mode is selected using user-programmable Flash Option Bits. See
Option Bits
The Flash Option bit XTLDIS controls whether the crystal oscillator is enabled during
reset. The crystal may later be disabled after reset if a new oscillator has been selected as
the system clock. If the crystal is manually enabled after reset through the OSCCTL regis-
ter, the user code must wait at least 1000 crystal oscillator cycles for the crystal to
stabilize. After this, the crystal oscillator may be selected as the system clock.
The stabilization time varies depending on the crystal or resonator used, as well as on the
feedback network. See
lization times.
Minimum power for use with very low frequency crystals (32 kHz–1 MHz).
Medium power for use with medium frequency crystals or ceramic resonators
(0.5 MHz to 8 MHz).
Maximum power for use with high frequency crystals (8 MHz to 20 MHz).
On-chip oscillator configured for use with external RC networks (<4 MHz).
on page 153 for information.
Table 111
for transconductance values to compute oscillator stabi-
®
System Clock Selection
F082A Series contain an on-chip crystal
IN
input pin can also accept a CMOS-level clock
IN
input pin determines the
Z8 Encore! XP
on page 187).
Product Specification
®
F082A Series
Crystal Oscillator
OUT
pin must
Flash
193