P89V52X2FN datasheet(37/56 Pages) PHILIPS

37 / 56 page

P89V52X2_1

Preliminary data sheet

Rev. 01 — 7 June 2007

37 of 56

NXP Semiconductors

P89V52X2

80C51 with 256 B RAM, 192 B data EEPROM

An assembly language routine to load the page register and perform an erase/program

operation is shown below. This code assumes the data EEPROM has been mapped into

user code space.

;**************************************************

pgm user code

;**************************************************

;* Inputs:

;* R3 = number of bytes to program (byte)

;* R4 = page address MSB(byte)

;* R5 = page address LSB(byte)

;* R7 = pointer to data buffer in RAM(byte)

;* Outputs:

;* R7 = status (byte)

;* C = clear on no error, set on error

Table 34.

Flash Memory Control register (FMCON - address E4H) bit description

Bit

Symbol

Access

Description

ERR

Set when either of the following conditions occur:

• Device was reset before the operation was completed.

• Attempt made to access data EEPROM while Data Access Protect (DAP) is set.

• An error occurs in the device’s internal high voltage circuits.

FMCMD.0

Command byte bit 0.

Security violation. Set when an attempt is made to program, erase, or CRC a secured page.

The specific cause of the security violation depends on the operation:

• PROG or EP: CSEC.0 = 1 or DPxSEC.1 = 1 for the page addressed by FMADRH/L.

• ERS_G: Any DPxSEC.0 = 1.

• ERS_DP: DPxSEC.2 = 1 for addressed page while in execution mode.

• CRC_DP: DPxCSEC.0 = 1 and DPxSEC.1 = 0

FMCMD.1

Command byte bit 1

Reserved

FMCMD.2

Command byte bit 2.

Reserved

FMCMD.3

Command byte bit 3.

DAP

Data Access Protect. When set, access to the data EEPROM is unmapped and thus

prohibited. Set by the MAP command. Cleared by the UNMAP command.

FMCMD.4

Command byte bit 4.

Reserved

FMCMD.5

Command byte bit 5.

When set, indicates that data EEPROM writes during program execution are enabled.

FMCMD.6

Command byte bit 6.

BUSY

Indicates that a program, erase, CRC calculation or similar operation is in progress. Note that

this bit is usable only in ICP mode since the CPU is stalled whenever this bit is set in execution

mode.

FMCMD.7

Command byte bit 7.

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