Z8F011ASH020EG2156 ZiLOG, Z8F011ASH020EG2156 Datasheet - Page 172

• Manufacturer Part Number: Z8F011ASH020EG2156
• Description: 8-bit Microcontrollers - MCU 1K FLASH 256B RAM 16B NVDS
• Manufacturer: ZiLOG

Specifications of Z8F011ASH020EG2156

• Rohs: yes
• Core: eZ8
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 1 KB
• Data Ram Size: 256 B
• On-chip Adc: No
• Package / Case: SOIC-20
• Mounting Style: SMD/SMT
• Interface Type: UART
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 17
• Number Of Timers: 2
• Program Memory Type: Flash
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V

PS025113-1212
Bit
Field
RESET
R/W
Address
Bit
[7]
INTEN
[6]
XTLEN
[5]
WDTEN
Oscillator Control Register Definitions
Caution:
Description
Internal Precision Oscillator Enable
1 = Internal Precision Oscillator is enabled.
0 = Internal Precision Oscillator is disabled.
Crystal Oscillator Enable
This setting overrides the GPIO register control for PA0 and PA1.
1 = Crystal oscillator is enabled.
0 = Crystal oscillator is disabled.
Watchdog Timer Oscillator Enable
1 = Watchdog Timer Oscillator is enabled.
0 = Watchdog Timer Oscillator is disabled.
INTEN
R/W
7
1
The following section provides the bit definitions for the Oscillator Control Register.
Oscillator Control Register
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.
Figure 24 displays the oscillator control clock switching flow. See
to review the waiting times of various oscillator circuits.
It is possible to disable the clock failure detection circuitry as well as all functioning
clock sources. In this case, the Z8 Encore! F0830 Series device ceases functioning and
can only be recovered by power-on-reset.
XTLEN
E7H
R/W
Table 99. Oscillator Control Register (OSCCTL)
6
0
followed by
WDTEN
R/W
5
1
18H
to the Oscillator Control Register unlocks it. The register
POFEN
R/W
4
0
F86H
WDFEN
R/W
3
0
Oscillator Control Register Definitions
R/W
Z8 Encore!
2
0
Product Specification
Table 117
SCKSEL
R/W
1
0
®
F0830 Series
on page 189
R/W
0
0
154