z16f2811 ZiLOG Semiconductor, z16f2811 Datasheet - Page 343

• Manufacturer Part Number: z16f2811
• Description: High Performance Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Oscillator Control Register Definitions
Table 180. Oscillator Control Register (OSCCTL)
PS022006-0207
Bit Position
[7]
INTEN
[6]
XTLEN
[5]
WDTEN
[4]
POFEN
* The reset value is 1 if the option bit LPOPT is 0.
RESET
FIELD
ADDR
BITS
R/W
Oscillator Control Register
INTEN
R/W
7
1
The Oscillator Control register (OSCCTL) enables or disables the various oscillator
circuits, enables/disables the failure detection/recovery circuitry, actively powers down
the flash, and selects the primary oscillator, which becomes the system clock.
The Oscillator Control register must be unlocked before writing. Writing the two-step
sequence
The register locks after completion of a register write to the OSCCTL.
Value (H)
If the WDT is the primary oscillator or if the Watchdog Timer oscillator is disabled,
de-assert the
0
1
0
1
0
1
0
1
XTLEN
E7H
R/W
6
0
Description
Internal Precision Oscillator Enable
Internal precision oscillator is disabled.
Internal precision oscillator is enabled.
Crystal Oscillator Enable
Crystal oscillator is disabled.
Crystal oscillator is enabled.
WDT Oscillator Enable
WDT oscillator is disabled
WDT oscillator is enabled
Primary Oscillator Failure Detection Enable
Failure detection and recovery of primary oscillator is disabled. This bit is
cleared automatically if a primary oscillator failure is detected.
Failure detection and recovery of primary oscillator is enabled
WDFEN
followed by
WDTEN
bit of the OSCCTL register.
R/W
5
1
P R E L I M I N A R Y
18H
to the Oscillator Control Register address unlocks it.
POFEN
R/W
4
0
FF_E0A0H
WDFEN
R/W
3
0
FLPEN
R/W
0*
2
Product Specification
ZNEO
1
Oscillator Control
™
SCKSEL
Z16F Series
R/W
00
0
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