Z8F021ASH020SC datasheet(169/276 Pages) ZILOG

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PS022815-0206

Flash Option Bits

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

FIELD

TRMADR - Trim Bit Address (00H to 1FH)

RESET

000

R/W

R/WR/W

ADDR

FF6H

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