ADUC831BCP datasheet(29/76 Pages) AD

29 / 76 page

REV. 0

ADuC831

–29–

USING THE FLASH/EE DATA MEMORY

The 4 kBytes of Flash/EE data memory is configured as 1024

pages, each of four bytes. As with the other ADuC831 peripherals,

the interface to this memory space is via a group of registers mapped

in the SFR space. A group of four data registers (EDATA1–4)

are used to hold the four bytes of data at each page. The page is

addressed via the two registers EADRH and EADRL. Finally,

ECON is an 8-bit control register that may be written with one

of nine Flash/EE memory access commands to trigger various

read, write, erase, and verify functions.

A block diagram of the SFR interface to the Flash/EE data

memory array is shown in Figure 20.

ECON—Flash/EE Memory Control SFR

Programming of either the Flash/EE data memory or the Flash/EE

program memory is done through the Flash/EE memory control

SFR (ECON). This SFR allows the user to read, write, erase, or

verify the 4 kBytes of Flash/EE data memory or the 56 kBytes of

Flash/EE program memory.

BYTE 1

(0000H)

BYTE 1

(0004H)

BYTE 1

(0008H)

BYTE 1

(000CH)

BYTE 1

(0FF8H)

BYTE 1

(0FFCH)

BYTE 2

(0001H)

BYTE 2

(0005H)

BYTE 2

(0009H)

BYTE 2

(000DH)

BYTE 2

(0FF9H)

BYTE 2

(0FFDH)

BYTE 3

(0002H)

BYTE 3

(0006H)

BYTE 3

(000AH)

BYTE 3

(000EH)

BYTE 3

(0FFAH)

BYTE 3

(0FFEH)

BYTE 4

(0003H)

BYTE 4

(0007H)

BYTE 4

(000BH)

BYTE 4

(000FH)

BYTE 4

(0FFBH)

BYTE 4

(0FFFH)

01H

00H

02H

03H

3FEH

3FFH

BYTE

ADDRESSES

ARE GIVEN IN

BRACKETS

Figure 20. Flash/EE Data Memory Control and Configuration

Table VII. ECON—Flash/EE Memory Commands

COMMAND DESCRIPTION

ECON VALUE

(NORMAL MODE) (Power-On Default)

(ULOAD MODE)

01H

Results in 4 bytes in the Flash/EE data memory,

Not Implemented. Use the MOVC instruction.

READ

addressed by the page address EADRH/L, being read

into EDATA1–4.

02H

Results in four bytes in EDATA1–4 being written to

Results in bytes 0-255 of internal XRAM being written

WRITE

the Flash/EE data memory, at the page address given by

to the 256 bytes of Flash/EE program memory at the

EADRH/L (0

≤ EADRH/L < 0400H.

page address given by EADRH. (0

≤ EADRH < E0H)

Note: The four bytes in the page being addressed must

Note: The 256 bytes in the page being addressed must

be pre-erased.

03H

Reserved Command

04H

Verifies if the data in EDATA1–4 is contained in the

Not Implemented. Use the MOVC and MOVX

VERIFY

page address given by EADRH/L. A subsequent read

instructions to verify the WRITE in software.

of the ECON SFR will result in a 0 being read if the

verification is valid, or a nonzero value being read to

indicate an invalid verification.

05H

Results in the Erase of the 4-byte page of Flash/EE data

Results in the 64-byte page of Flash/EE program

ERASE PAGE

memory addressed by the page address EADRH/L.

memory, addressed by the byte address EADRH/L

being erased. EADRL can equal any of 64 locations

within the page. A new page starts whenever EADRL

is equal to 00H, 40H, 80H, or C0H.

06H

Results in the erase of entire 4 kBytes of Flash/EE

Results in the Erase of the entire 56 kBytes of ULOAD

ERASE ALL

data memory.

Flash/EE program memory.

81H

Results in the byte in the Flash/EE data memory,

Not Implemented. Use the MOVC command.

READBYTE

addressed by the byte address EADRH/L, being read

into EDATA1. (0

≤ EADRH/L ≤ 0FFFH).

82H

Results in the byte in EDATA1 being written into

WRITEBYTE

Flash/EE data memory, at the byte address EADRH/L.

Flash/EE program memory, at the byte address

EADRH/L (0

≤ EADRH/L ≤ DFFFH).

0FH

Leaves the ECON instructions to operate on the

Enters NORMAL mode directing subsequent ECON

EXULOAD

Flash/EE data memory.

instructions to operate on the Flash/EE data memory.

F0H

Enters ULOAD mode, directing subsequent ECON

Leaves the ECON instructions to operate on the

ULOAD

instructions to operate on the Flash/EE program memory.

Flash/EE program memory.

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