ADE5166 datasheet(110/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 110 of 156

Flash Functions

The following sample 8052 code is provided to demonstrate how to

use the the flash functions. For these examples, Flash Memory

Byte 0x3C00 is accessed.

Write Byte

Write 0xF3 into Flash Memory Byte 0x3C00.

MOV EDATA, #F3h

; Data to be written

MOV EADRH, #3Ch

; Set up byte address

MOV EADRL, #00h

MOV FLSHKY, #3Bh

; Write flash security

key.

MOV ECON, #01H

; Write byte

Erase Page

Erase the page containing Flash Memory Byte 0x3C00.

MOV EADRH, #3Ch

; Select page through

byte address

MOV EADRL, #00h

MOV FLSHKY, #3Bh

; Write flash security

key.

MOV ECON, #02H

; Erase Page

Erase All

Erase all of the 62 kB flash memory.

MOV FLSHKY, #3Bh

; Write flash security

key.

MOV ECON, #03H

; Erase all

Read Byte

Read Flash Memory Byte 0x3C00.

MOV EADRH, #3Ch

; Set up byte address

MOV EADRL, #00h

MOV FLSHKY, #3Bh

; Write flash security

key.

MOV ECON, #04H

; Read byte

; Data is ready in EDATA register

Note that the read byte command can be used to view the status

of the protection bytes located in the upper 21 bytes, Page 123.

The write byte command is not valid for this area.

PROTECTING THE FLASH MEMORY

Two forms of protection are offered for this flash memory: read

protection and write/erase protection. The read protection ensures

that any pages that are read protected cannot be read by the end

user. The write protection ensures that the flash memory cannot

be erased or written over. This protects the final product from

tampering and can prevent the code from being overwritten in

the event of a runaway program.

Write/erase protection is individually selectable for all 124 pages.

Read protection is selected in groups of four pages (see Figure 95

for the groupings). The protection bits are stored in the last flash

memory locations, Address 0xF7EB through Address 0xF7FF

(see Figure 96). Sixteen bytes are reserved for write/erase pro-

tection, four bytes for read protection, and another byte to set

the flash protection key (PROTKY, Address 0xBB). The user

must enable write/erase protection for the last page, at a minimum,

for the entire protection scheme to work.

Note that the read protection does not prevent MOVC commands

from being executed within the code.

There is an additional layer of protection offered by a flash pro-

tection security key (PROTKY) that can be set up by the user so

that the protection scheme cannot be changed without this key.

After the protection key has been configured, it cannot be

modified.

Enabling Flash Protection by Code

The protection bytes in the flash can be programmed by using

the flash controller command and programming the ECON

SFR to 0x08. Issuing the ECON protection command initiates

the programming of one byte of protection data. The EADRL

(Address 0xC6) and EDATA (Address 0xBC) data pointer SFRs

are used to store the least significant address and data bytes,

respectively. Note that the EADRH data pointer SFR is not used

in this command.

The following sequence should be followed to enable the flash

protection:

Set the EDATA flash data pointer with the write/erase or

read protection data. When erased, the protection bits default

to 1, like any other bit of flash memory. The default protection

setting is for no protection. To enable protection, write a 0

to the bits corresponding to the pages that should be pro-

tected. Note that when setting the read protection, each

protection bit protects four pages.

Set the EADRL flash data pointer with the least significant

byte of the protection address. For example, to access the

protection on Page 112 through Page 119 (Address 0xF7FE),

EADRL should be written to 0xFE.

Enable access to the flash by writing 0x3B to the FLSHKY

SFR (Address 0xBA).

Issue the protection command by writing 0x08 to the

ECON SFR (Address 0xB9).

Step 1 to Step 3 should be repeated for each byte that requires

protection. While configuring the final byte of write/read pro-

tection, the PROTKY SFR (Address 0xBB) can be enabled for a

further level of code security. If enabled, the flash protection key is

required to modify the protection scheme. To enable the flash

protection key, the Flash Location 0xF7EB where the PROTKY

is located should be written to using the flash control SFR (ECON,

Address 0xB9). The PROTKY can be written to any 8-bit value;

once configured, it cannot be modified. To enable the PROTKY

and activate the flash protection, the part must be reset.

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