P89V52X2FN datasheet(34/57 Pages) NXP

34 / 57 page

P89V52X2_3

Product data sheet

Rev. 03 — 4 May 2009

34 of 57

NXP Semiconductors

P89V52X2

80C51 with 256 B RAM, 192 B data EEPROM

The data EEPROM must be mapped into the code memory address space in order to

read, erase, or program the data EEPROM. The memory is read using the MOVC

instruction.

6.13.1 Features

• ICP with industry-standard commercial programmers

• IAP-Lite allows individual and multiple bytes of data EEPROM to be programmed

under control of the end application.

• Programming and erase over the full operating voltage range

• Programming/Erase using ICP or IAP-Lite

• Program or erases requires 2 ms, 4 ms, or 6 ms, depending on the operation

• Programmable security for the data in each page

• > 100000 typical erase/program cycles for each byte

• Data EEPROM mapped into code space for quick MOVC reading

6.13.2 Register interface

Erasing, programming, and mapping operations are performed in the application under

the control of the microcontroller’s ﬁrmware using four SFRs and an internal 64-byte ‘page

• FMCON (Flash Control Register). When read, this is the status register. When written,

this is a command register. Note that the status bits are cleared to logic 0s when the

command is written.

• FMADRL, FMADRH (Flash memory address low, Flash memory address high). Used

to specify the byte address within the page register or specify the page within user

code memory (for programming, erase, and reading the data EEPROM is mapped

into the user address space (see Table 32).

• FMDATA (Flash Data Register). Accepts data to be loaded into the page register.

Data is read by mapping the data EEPROM into the code memory space and using the

MOVC instruction.

6.13.3 Mapping the data EEPROM into code space

In order to read, erase, or program the data EEPROM must be mapped into the code

memory address space. This is accomplished by writing the MAP command (09H) to

FMCON. The data EEPROM may be unmapped by writing the UNMAP command (0AH)

to FMCON. The mapping of the data EEPROM pages into code memory space is shown

in Table 32.

6.13.4 Reading the data EEPROM

Reading the data EEPROM can be achieved by performing the following sequence:

Table 32.

Data EEPROM page addresses

Data EEPROM page

Start address End address

FF00H

FF3FH

FF40H

FF7FH

FF80H

FFBFH

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