ZUSBOPTSC01ZACG datasheet(177/282 Pages) ZILOG

177 / 282 page

PS022827-1212

P R E L I M I N A R Y

Operation

Z8 Encore! XP® F082A Series

Product Specification

160

Option Bit Types

This section describes the five types of Flash option bits.

User Option Bits

The user option bits are contained in the first two bytes of program memory. User access

to these bits has been provided because these locations contain application-specific device

configurations. The information contained here is lost when page 0 of the program mem-

ory is erased.

Trim Option Bits

The trim option bits are contained in the information page of the Flash memory. These bits

are factory programmed values required to optimize the operation of onboard analog cir-

cuitry and cannot be permanently altered. Program Memory may be erased without endan-

gering these values. It is possible to alter working values of these bits by accessing the

Trim Bit Address and Data registers, but these working values are lost after a power loss

or any other reset event.

There are 32 bytes of trim data. To modify one of these values the user code must first

write a value between 00H and 1FH into the Trim Bit Address Register. The next write to

the Trim Bit Data Register changes the working value of the target trim data byte.

Reading the trim data requires the user code to write a value between 00H and 1FH into the

Trim Bit Address Register. The next read from the Trim Bit Data Register returns the

working value of the target trim data byte.

The trim address range is from information address 20–3F only. The remainder of the

information page is not accessible through the trim bit address and data registers.

Calibration Option Bits

The calibration option bits are also contained in the information page. These bits are fac-

tory-programmed values intended for use in software correcting the device’s analog per-

formance. To read these values, the user code must employ the LDC instruction to access

the information area of the address space as defined in See the Flash Information Area sec-

tion on page 17.

Serialization Bits

As an optional feature, Zilog is able to provide factory-programmed serialization. For seri-

alized products, the individual devices are programmed with unique serial numbers. These

serial numbers are binary values, four bytes in length. The numbers increase in size with

each device, but gaps in the serial sequence may exist.

Note:

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