Z8 Encore!® Motor Control Flash MCUs
Product Specification
224
It is possible to alter the working values of these bits by accessing the Trim Bit Address
Caution:
and Data registers, but these working values are lost after a Reset.
There are 32 trim addresses. To read or write these values, the user code must first write a
value between 00hand 1Fhinto the Trim Bit Address Register. Writing the Trim Bit Data
Register changes the working value of the target trim data. Reading the Trim Bit Data
Register returns the working value of the target trim data.
User Option Bit Configuration By Reset
Each time the user option bits are programmed or erased, the device must be Reset for the
change to take place.
Option Bit Address Space
The first two bytes of program memory at addresses 0000h, shown in Table 122, and
0001h, shown in Table 123, are reserved for the user option bits.
Program Memory Address 0000H
Table 122. User Option Bits at Program Memory Address 0000H
BITS
FIELD
RESET
R/W
7
6
5
4
3
2
RP
1
0
WDT_RES WDT_AO
OSC_SEL[1:0]
VBO_AO
Reserved
FWP
U
U
U
U
U
U
U
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Program Memory 0000H
ADDR
Note: U = Unchanged by Reset. R/W = Read/Write.
Bit
Value
(H)
Description
Position
[7]
Watch-Dog Timer Reset
WDT_RES
0
1
Watch-Dog Timer time-out generates an interrupt request. Interrupts must be
globally enabled for the eZ8 CPU to acknowledge the interrupt request.
Watch-Dog Timer time-out causes a Reset.
[6]
Watch-Dog Timer Always On
WDT_AO
0
1
Watch-Dog Timer is automatically enabled.
Watch-Dog Timer is enabled upon execution of the WDT instruction.
Option Bits
P R E L I M I N A R Y
PS024604-1005
ZILOG [ ZILOG, INC. ]
