z8f083a ZiLOG Semiconductor, z8f083a Datasheet - Page 135

• Manufacturer Part Number: z8f083a
• Description: High-performance 8-bit Microcontrollers
• Manufacturer: ZiLOG Semiconductor

Table 80. Flash Options Bits at Program Memory Address 0001H
BITS
FIELD
RESET
R/W
ADDR
Note: U = Unchanged by Reset. R/W = Read/Write.
PS026308-1207
Note:
Flash Program Memory Address 0001H
VBO_RES
R/W
U
7
FWP—Flash write protect
This option bit provides Flash program memory protection.
0 = Programming and erasure disabled for all 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 Flash program memory.
VBO_RES -Voltage Brownout reset
1 = VBO detection causes a system reset. This is the default setting for unprogrammed
(erased) Flash.
Reserved—Must be 1
XTLDIS—State of crystal oscillator at reset
This bit enables only the crystal oscillator. The selection of crystal oscillator as the system
clock must be done 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.
R/W
U
6
Reserved
R/W
U
5
Program Memory 0001H
XTLDIS
R/W
U
4
R/W
U
3
R/W
Z8 Encore!
U
2
Reserved
Product Specification
R/W
U
1
®
F083A Series
Flash Option Bits
R/W
U
0
123