ADE5166_08 AD [Analog Devices], ADE5166_08 Datasheet - Page 102

• Manufacturer Part Number: ADE5166_08
• Description: Single-Phase Energy Measurement IC with 8052 MCU, RTC, and LCD Driver
• Manufacturer: AD [Analog Devices]

ADE5166/ADE5169
ECON—Flash Control SFR
Programming 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 such 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.
Table 104. Flash Control SFR (ECON, Address 0xB9)
Bit
[7:0]
Table 105. Flash Key SFR (FLSHKY, Address 0xBA)
Bit
[7:0]
Table 106. Flash Protection Key SFR (PROTKY, Address 0xBB)
Bit
[7:0]
Table 107. Flash Data SFR (EDATA, Address 0xBC)
Bit
[7:0]
Table 108. Flash Low Byte Address SFR (EADRL, Address 0xC6)
Bit
[7:0]
Table 109. Flash High Byte Address SFR (EADRH, Address 0xC7)
Bit
[7:0]
ECON
Mnemonic
FLSHKY
Mnemonic
PROTKY
Mnemonic
EDATA
Mnemonic
EADRL
Mnemonic
EADRH
Mnemonic
Default
0xFF
Default
0xFF
Default
0
Default
0
Default
0
Default
0
Value
1
2
3
4
5
6
7
8
Description
The content of this SFR is compared to the flash key, 0x3B. If the two values match, the next ECON
operation is allowed (see the Protecting the Flash Memory section).
Description
The content of this SFR is compared to the flash memory location at Address 0xF7EA. If the two values
match, the update of the write/erase and read protection set up 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.
Description
Flash pointer data.
Description
Flash pointer low byte address.
Description
Flash pointer high byte address.
Description
Write byte. The value in EDATA 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 EADRH and EADRL. 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.
Reserved.
Reserved.
Protect code (see the Protecting the Flash Memory section).
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The program counter, PC, is held on the instruction where the
ECON SFR is written to until the flash memory controller is
done performing the requested operation. Then the PC incre-
ments to continue 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.