Z8F042ASJ020EG2156 Datasheet, PDF (178/280 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F082A Series
Product Specification
163
Bit
Description (Continued)
[5:4]
Oscillator Mode Selection
OSC_SEL[1:0] 00 = On-chip oscillator configured for use with external RC networks (<4MHz).
01 = Minimum power for use with very low frequency crystals (32 kHz to 1.0 MHz).
10 = Medium power for use with medium frequency crystals or ceramic resonators
(0.5 MHz to 5.0 MHz).
11 = Maximum power for use with high frequency crystals (5.0 MHz to 20.0 MHz). This
setting is the default for unprogrammed (erased) Flash.
[3]
VBO_AO
Voltage Brown-Out Protection Always On
0 = Voltage Brown-Out Protection can be disabled in Stop Mode to reduce total power
consumption. For the block to be disabled, the power control register bit must also be
written (see the Power Control Register Definitions section on page 33).
1 = Voltage Brown-Out Protection is always enabled including during Stop Mode. This
setting is the default for unprogrammed (erased) Flash.
[2]
FRP
Flash Read Protect
0 = User program code is inaccessible. Limited control features are available through the
On-Chip Debugger.
1 = User program code is accessible. All On-Chip Debugger commands are enabled.
This setting is the default for unprogrammed (erased) Flash.
[1]
Reserved
This bit is reserved and must be programmed to 1.
[0]
FWP
Flash Write Protect
This Option Bit provides Flash Program Memory protection:
0 = Programming and erasure disabled for all of Flash Program Memory. Programming,
Page Erase and Mass Erase through User Code is disabled. Mass Erase is available
using the On-Chip Debugger.
1 = Programming, Page Erase and Mass Erase are enabled for all of Flash program
memory.
PS022828-0413
PRELIMINARY
Flash Option Bit Address Space