Z8 Encore! XP® 4K Series
Product Specification
150
Randomized Lot Identification Bits
As an optional feature, ZiLOG is able to provide a factory-programmed random lot identi-
fier. With this feature, all devices in a given production lot will be programmed with the
same random number. This random number is uniquely regenerated for each successive
production lot and is not likely to be repeated.
The randomized lot identifier is a 32 byte binary value, stored in the flash information
page (see Reading the Flash Information Page on page 150 and Randomized Lot Identifier
on page 159 for more details) and is unaffected by mass erasure of the device's flash mem-
ory.
Reading the Flash Information Page
The following code example shows how to read data from the flash information area.
; get value at info address 60 (FE60h)
ldx FPS, #%80 ; enable access to flash info page
ld R0, #%FE
ld R1, #%60
ldc R2, @RR0 ; R2 now contains the calibration value
Flash Option Bit Control Register Definitions
Trim Bit Address Register
The Trim Bit Address (TRMADR) register contains the target address for an access to the
trim option bits.
Table 87. Trim Bit Address Register (TRMADR)
BITS
7
6
5
4
3
2
1
0
TRMADR - Trim Bit Address (00H to 1FH)
FIELD
RESET
R/W
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
FF6H
ADDR
PS022815-0206
Flash Option Bits
ZILOG [ ZILOG, INC. ]
