Datasheet

ADE7116/ADE7156/ADE7166/ADE7169/ADE7566/ADE7569
Rev. B | Page 109 of 152
FLASH MEMORY ORGANIZATION
The 16 kB array of flash memory provided by the ADE7116/
ADE7156/ADE7166/ADE7169/ADE7566/ADE7569 are
segmented into 32 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.
0x3E00
0x3DFF
0x3C00
0x3BFF
0x3A00
0x39FF
0x3800
0x37FF
0x3600
0x35FF
0x3400
0x33FF
0x3200
0x31FF
0x3000
0x2FFF
0x2E00
0x2DFF
0x2C00
0x2BFF
0x2A00
0x29FF
0x2800
0x27FF
0x2600
0x25FF
0x2400
0x23FF
0x2200
0x21FF
0x2000
0x3FFF
CONTAINS PROTECTION SETTINGS.
READ
PROTECT
BIT 7
READ
PROTECT
BIT 6
READ
PROTECT
BIT 5
READ
PROTECT
BIT 4
PAGE 30
PAGE 29
PAGE 28
PAGE 27
PAGE 26
PAGE 25
PAGE 24
PAGE 23
PAGE 22
PAGE 21
PAGE 20
PAGE 19
PAGE 18
PAGE 17
PAGE 16
PAGE 31
0x1E00
0x1DFF
0x1C00
0x1BFF
0x1A00
0x19FF
0x1800
0x17FF
0x1600
0x15FF
0x1400
0x13FF
0x1200
0x11FF
0x1000
0x0FFF
0x0E00
0x0DFF
0x0C00
0x0BFF
0x0A00
0x09FF
0x0800
0x07FF
0x0600
0x05FF
0x0400
0x03FF
0x0200
0x01FF
0x0000
0x1FF
F
READ
PROT
ECT
BIT 3
READ
PROTECT
BIT 2
READ
PROTECT
BIT 1
READ
PROTECT
BIT 0
PAGE 14
PAGE 13
PAGE 12
PAGE 11
PAGE 10
PAGE 9
PAGE 8
PAGE 7
PAGE 6
PAGE 5
PAGE 4
PAGE 3
PAGE 2
PAGE 1
PAGE 0
PAGE 15
06353-068
Figure 94. Flash Memory Organization
The flash memory can be protected from read or write/erase
access. The protection is implemented in the upper page of
user program memory, Page 31. Four of the bytes from this
page are used to set up write/erase protection for each page.
Another byte is 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. The last page of flash
memory must be write/erase protected at a minimum.
The implication of write/erase protecting the last page is that
the content of the 506 bytes in this page that are available to the
user must not change.
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 30 are, therefore, available for general
program and data memory use. It is recommended that Page 31
be used for constants or code that do not require future
modifications. Note that the last six bytes of Page 31 are
reserved for the flash memory protection and are, therefore,
unavailable to the user.
USING THE FLASH MEMORY
The 16 kB of flash memory are configured as 32 pages, each
comprising 512 bytes. As with the other ADE7116/ADE7156/
ADE7166/ADE7169/ADE7566/ADE7569 peripherals, the
interface to this memory space is via a group of registers
mapped in the SFR space (see Table 101).
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). Finally, the ECON SFR (Address 0xB9) is an 8-bit
control register that can be written to with one of seven flash
memory access commands to trigger various read, write, erase,
and verify functions.
Table 101. Flash SFRs
SFR Address Default
Bit
Addressable
Description
ECON 0xB9 0x00 No Flash control.
FLSHKY 0xBA 0xFF No Flash key.
PROTKY 0xBB 0xFF No
Flash protection
key.
EDATA 0xBC 0x00 No Flash data.
PROTB0 0xBD 0xFF No
Flash W/E
Protection 0.
PROTB1 0xBE 0xFF No
Flash W/E
Protection 1.
PROTR 0xBF 0xFF No
Flash read
protection.
EADRL 0xC6 0x00 No
Flash low byte
address.
EADRH 0xC7 0x00 No
Flash high byte
address.
Figure 95 demonstrates the steps required for access to the flash
memory.