Z8F4822AR020SG Datasheet, PDF (201/323 Pages) Zilog, Inc. – High Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F64xx Series
Product Specification
181
Flash Memory Address 0000H
Table 99. Flash Option Bits At Flash Memory Address 0000H
Bit
7
6
5
4
3
2
Field
WDT_RES WDT_AO OSC_SEL[1:0] VBO_AO RP
RESET
U
R/W
R/W
Address
Program Memory 0000H
Note: U = Unchanged by Reset; R/W = Read/Write.
1
Reserved
0
FWP
Bit
Description
[7]
WDT_RES
Watchdog Timer Reset
0 = Watchdog Timer time-out generates an interrupt request. Interrupts must be globally
enabled for the eZ8 CPU to acknowledge the interrupt request.
1 = Watchdog Timer time-out causes a Short Reset. This setting is the default for unpro-
grammed (erased) Flash.
[6]
WDT_AO
Watchdog Timer Always On
0 = Watchdog Timer is automatically enabled upon application of system power. Watch-
dog Timer can not be disabled except during STOP Mode (if configured to power
down during STOP Mode).
1 = Watchdog Timer is enabled upon execution of the WDT instruction. Once enabled,
the Watchdog Timer can only be disabled by a Reset or Stop Mode Recovery. This
setting is the default for unprogrammed (erased) Flash.
[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 10.0 MHz).
11 = Maximum power for use with high frequency crystals (8.0 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 is disabled in STOP Mode to reduce total power con-
sumption.
1 = Voltage Brown-Out Protection is always enabled including during STOP Mode. This
setting is the default for unprogrammed (erased) Flash.
[2]
Read Protect
RP
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.
PS019924-0113
PRELIMINARY
Option Bit Address Space