ADE5166 datasheet(100/148 Pages) AD

100 / 148 page

ADE5166/ADE5169

Rev. 0 | Page 100 of 148

The lower 62 bytes are available to the user for program storage

or as nonvolatile data memory. They are segmented into 124 pages

of 512 bytes each. It is up to the user to decide which flash memory

is to be used for data memory. It is recommended that each page

be dedicated solely to program or data memory so that an

instance does not arise where the program counter is loaded

with data memory instead of an opcode from the program

memory or where program memory is erased to update a byte

of data memory.

The flash memory can be protected from read or write/erase access.

The protection is implemented in the upper page of user program

memory. The last sixteen bytes from this page are used to con-

figure the write/erase protection for each of the pages. The

remaining four bytes are used for configuring read protection of

the flash memory. The read protection is selected in groups of

four pages. Finally, there is a byte used to store the key required

for modifying the protection scheme. If any code protection is

required, the page of information memory must be write/erase

protected at a minimum.

Thus, it is recommended that if code protection is enabled, the

last page of user accessible flash memory should be used only to

store data that does not need modification in the field. If the

firmware requires protection and may need updating in the

future, the last page should be reserved for constants used by

the user code that do not require modification during

emulation or debug.

Page 0 through Page 122 are, therefore, available for general

program and data memory use. It is recommended that Page 123

be used for constants or code that do not require future modifica-

tions. Note that the last 20 bytes of page 123 are reserved for the

flash memory protection and are, therefore, unavailable to the user.

USING THE FLASH MEMORY

The 62 bytes of flash memory are configured as 124 pages, each

comprising 512 bytes. As with the other ADE5166/ADE5169

peripherals, the interface to this memory space is via a group of

registers mapped in the SFR space. The flash data SFR, (EDATA,

Address 0xBC) holds the byte of data to be accessed. The byte of

flash memory is addressed via the EADRH SFR (Address 0xC7)

and the EADRL SFR (Address 0xC6).

Table 103. Flash SFRs

SFR

Address

Default

Bit

Addressable

Description

ECON

0xB9

0x00

Flash control

FLSHKY

0xBA

0xFF

Flash key

PROTKY

0xBB

0xFF

Flash

protection key

EDATA

0xBC

0x00

Flash data

EADRL

0xC6

0x00

Flash low byte

address

EADRH

0xC7

0x00

Flash high byte

address

ECON is an 8-bit flash control SFR (Address 0xB9) that can be

written to with one of five flash memory access commands to

trigger various read, write, erase, and verify functions. Figure 89

demonstrates the steps required for access to the flash memory.

EADRH

FLSHKY

EADRL

ADDRESS ADDRESS

DECODER

FLSHKY = 0x3B?

PROTECTION

DECODER

ECON

COMMAND

ACCESS

ALLOWED?

FLASH

PROTECTION KEY

TRUE: ACCESS

ALLOWED

ECON = 0

FALSE: ACCESS

DENIED

ECON = 1

Figure 89. Flash Memory Read/Write/Erase Protection Block Diagram

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