ADE5166 datasheet(109/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 109 of 156

ECON—Flash Control SFR

Programming the flash memory is done through the flash control

SFR (ECON, Address 0xB9). This SFR allows the user to read,

write, erase, or verify the 62 kB of flash memory. As a method

of security, a key must be written to the flash key SFR (FLSHKY,

Address 0xBA) to initiate any user access to the flash memory.

Upon completion of the flash memory operation, the FLSHKY

SFR is reset so that it must be written to before another flash

memory operation. Requiring the key to be set before an access

to the flash memory decreases the likelihood of user code or

data being overwritten by a runaway program.

The program counter, PC, is held on the instruction where

the ECON SFR is written to until the flash memory controller

finishes the requested operation. Then the PC increments to con-

tinue with the next instruction. Any interrupt requests that occur

while the flash controller is performing an operation are not

handled until the flash operation is complete. All peripherals,

such as timers and counters, continue to operate as configured

throughout the flash memory access.

Table 105. Flash Control SFR (ECON, Address 0xB9)

Bit

Mnemonic

Default

Value

Description

[7:0]

ECON

Write byte. The value in the EDATA SFR (Address 0xBC) is written to the flash memory, at the

page address given by EADRH (Address 0xC7) and EADRL (Address 0xC6). Note that the byte

being addressed must be pre-erased.

Erase page. A 512-byte page of flash memory address is erased. The page is selected by the

address in the EADRH and EADRL SFRs. Any address in the page can be written to EADRH and

EADRL to select it for erasure.

Erase all. All 62 kB of the available flash memory are erased. Note that this command is used

during serial mode and parallel download mode but should not be executed by user code.

Read byte. The byte in the flash memory, addressed by EADRH and EADRL, is read into EDATA.

Reserved.

Protect code (see the Protecting the Flash Memory section).

Table 106. Flash Key SFR (FLSHKY, Address 0xBA)

Bit

Mnemonic

Default

Description

[7:0]

FLSHKY

0xFF

The contents of this SFR are compared to the flash key, 0x3B. If the two values match, the next ECON SFR

operation is allowed (see the Protecting the Flash Memory section).

Table 107. Flash Protection Key SFR (PROTKY, Address 0xBB)

Bit

Mnemonic

Default

Description

[7:0]

PROTKY

0xFF

The contents of this SFR are compared to the flash memory location at Address 0xF7EB. If the two values

match, the update of the write/erase and read protection setup is allowed (see the Protecting the Flash

Memory section).

If the protection key in the flash is 0xFF, the PROTKY SFR value is not used for comparison.

The PROTKY SFR is also used to write the protection key in the flash. This is done by writing the desired

value in PROTKY and writing 0x08 in the ECON SFR. This operation can be done only once.

Table 108. Flash Data SFR (EDATA, Address 0xBC)

Bit

Mnemonic

Default

Description

[7:0]

EDATA

Flash pointer data.

Table 109. Flash Low Byte Address SFR (EADRL, Address 0xC6)

Bit

Mnemonic

Default

Description

[7:0]

EADRL

Flash pointer low byte address.

Table 110. Flash High Byte Address SFR (EADRH, Address 0xC7)

Bit

Mnemonic

Default

Description

[7:0]

EADRH

Flash pointer high byte address.

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