Z8F042AHJ020SG Datasheet, PDF (181/282 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F082A Series
Product Specification
164
Flash Program Memory Address 0001H
Table 89. Flash Options Bits at Program Memory Address 0001H
Bit
7
6
5
4
3
Field
Reserved
XTLDIS
RESET
U
U
U
U
U
R/W
R/W
R/W
R/W
R/W
R/W
Address
Program Memory 0001H
Note: U = Unchanged by Reset. R/W = Read/Write.
2
1
Reserved
U
U
R/W
R/W
0
U
R/W
Bit
[7:5]
[4]
XTLDIS
Description
Reserved
These bits are reserved and must be programmed to 111.
State of the Crystal Oscillator at Reset
This bit only enables the crystal oscillator. Its selection as a system clock must be performed
manually.
0 = Crystal oscillator is enabled during reset, resulting in longer reset timing.
1 = Crystal oscillator is disabled during reset, resulting in shorter reset timing.
Caution: Programming the XTLDIS bit to zero on 8-pin versions of this device prevents any
further communication via the debug pin due to the fact that the XIN and DBG functions are
shared on pin 2 of this package. Do not program this bit to zero on 8-pin devices unless further
debugging or Flash programming is not required.
[3:0]
Reserved
These bits are reserved and must be programmed to 1111.
PS022827-1212
PRELIMINARY
Flash Option Bit Address Space