Z8F042AHJ020SC00TR Zilog, Z8F042AHJ020SC00TR Datasheet - Page 201

• 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

Table 109. Oscillator Control Register (OSCCTL)
Oscillator Control Register Definitions
BITS
FIELD
RESET
R/W
ADDR
PS022825-0908
Caution:
Oscillator Control Register
INTEN
R/W
1
7
The Oscillator Control Register (OSCCTL) enables/disables the various oscillator circuits,
enables/disables the failure detection/recovery circuitry and selects the primary oscillator,
which becomes the system clock.
The Oscillator Control Register must be unlocked before writing. Writing the two step
sequence
is locked at successful completion of a register write to the OSCCTL.
INTEN—Internal Precision Oscillator Enable
1 = Internal precision oscillator is enabled
0 = Internal precision oscillator is disabled
XTLEN—Crystal Oscillator Enable; this setting overrides the GPIO register control for
PA0 and PA1
1 = Crystal oscillator is enabled
0 = Crystal oscillator is disabled
WDTEN—Watchdog Timer Oscillator Enable
1 = Watchdog Timer oscillator is enabled
0 = Watchdog Timer oscillator is disabled
SOFEN—System Clock Oscillator Failure Detection Enable
1 = Failure detection and recovery of system clock oscillator is enabled
0 = Failure detection and recovery of system clock oscillator is disabled
It is possible to disable the clock failure detection circuitry as well as all functioning
clock sources. In this case, the Z8 Encore! XP F082A Series device ceases
functioning and can only be recovered by Power-On-Reset.
XTLEN
E7H
R/W
6
0
followed by
WDTEN
R/W
5
1
18H
to the Oscillator Control Register unlocks it. The register
SOFEN
R/W
0
4
F86H
WDFEN
R/W
3
0
Z8 Encore! XP
R/W
0
2
Product Specification
SCKSEL
R/W
1
0
®
F082A Series
Oscillator Control
R/W
0
0
190