T89C5115-RATIM datasheet(34/113 Pages) ATMEL

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AT89C5115

4128G–8051–02/08

Overview of FM0

Operations

The CPU interfaces the Flash memory through the FCON register and AUXR1 register.

These registers are used to:

•

Map the memory spaces in the adressable space

•

Launch the programming of the memory spaces

•

Get the status of the Flash memory (busy/not busy)

Mapping of the Memory Space By default, the user space is accessed by MOVC instruction for read only. The column

latches space is made accessible by setting the FPS bit in FCON register. Writing is

possible from 0000h to 3FFFh, address bits 6 to 0 are used to select an address within a

page while bits 14 to 7 are used to select the programming address of the page.

Setting FPS bit takes precedence on the EEE bit in EECON register.

The other memory spaces (user, extra row, hardware security) are made accessible in

the code segment by programming bits FMOD0 and FMOD1 in FCON register in accor-

dance with Table 21. A MOVC instruction is then used for reading these spaces.

Table 21. FM0 blocks Select bits

Launching Programming

FPL3:0 bits in FCON register are used to secure the launch of programming. A specific

sequence must be written in these bits to unlock the write protection and to launch the

programming. This sequence is 5xh followed by Axh. Table 22 summarizes the memory

spaces to program according to FMOD1:0 bits.

Table 22. Programming Spaces

Note:

The sequence 5xh and Axh must be executing without instructions between them other-

wise the programming is aborted.

Interrupts that may occur during programming time must be disabled to avoid any spuri-

ous exit of the programming mode.

FMOD1

FMOD0

FM0 Adressable Space

User (0000h-3FFFh)

Extra Row(FF80h-FFFFh)

Hardware Security Byte (0000h)

Reserved

Write to FCON

Operation

FPL3:0

FPS

FMOD1

FMOD0

User

No action

Write the column latches in user

space

Extra Row

No action

Write the column latches in extra row

space

Hardware

Security

Byte

No action

Write the fuse bits space

Reserved

No action

T89C5115-RATIM 데이터시트(PDF) 34 Page - ATMEL Corporation

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