ADE5166 datasheet(103/148 Pages) AD

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Preliminary Technical Data

ADE5166/ADE5169/ADE5566/ADE5569

Rev. PrB | Page 103 of 148

Flash Functions

The following sample 8051 code is provided below to

demonstrate how to use the Flash functions. For these

examples, the byte of flash memory, 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

; Setup 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 end

system 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 73 for the groupings). The protection bits are stored in

the last flash memory locations, Address 0xF7EB through

Address 0xF7FF (see Figure 74). 16 bytes are reserved for

write/erase protection, 4 bytes for read protection and another

byte to set the protection security key. 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 protection

security key. The user can setup a protection security key so

that the protection scheme cannot be changed without this key.

Once the protection key has been configured, it may not be

modified.

Enabling Flash Protection by Code

The protection bytes in the Flash can be programmed using

Flash controller command and programming ECON to 0x08.

Issuing the ECON protection command initiates the program-

ming of 1 byte of protection data. The EADRL and EDATA data

pointers are used to store the least significant address and data

bytes, respectively. Note that the EADRH data pointer is not

used in this command.

The following sequence should be followed to enable the flash

protection:

Set the EDATA 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 protected. Note that when setting the read

protection that each protection bit protects four pages.

Set the EADRL data pointer with the least significant byte

of the protection address. For example, to access the

protection on the Page 112 through Page 119 (Address

0xF7FE), EADRL should be written to 0xFE.

Enable access to the flash by writing 3Bh to the FLSHKY

Issue the protection command by writing 08H to the

ECON register.

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

protection. While configuring the final byte of write/read

protection, the PROTKY can be enabled for a further level of

code security. If enabled, the protection key is required to

modify the protection scheme. To enable the protection key, the

flash location 0xF7EB where the PROTKY is located should be

written to using the ECON protection command (0x8). The

PROTKY can be written to any 8-bit value, but once configured,

it cannot be modified. To enable the PROTKY and activate the

flash protection, the part has to be reset.

Note that once the PROTKY has been activated by a reset any

further changes to the protection require the new 8-bit protection

key to be written to the PROTKY SFR prior to issuing the ECON

command. The PROTKY SFR is cleared automatically when the

ECON 0x8 command is issued and, therefore, the user must

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