ADuC7060
Table 13. FEEMOD MMR Bit Designations
FEECON Register
Bit
15:9
8
Description
Reserved.
Reserved. Always set this bit to 0.
FEECON is an 8-bit command register. The commands are
described in Table 14.
7:5
4
Reserved. Always set these bits to 0 except when
writing keys.
Flash/EE interrupt enable.
Set by user to enable the Flash/EE interrupt. The
Name:
Address:
Default value:
FEECON
0xFFFF0E08
0x07
interrupt occurs when a command is complete.
Cleared by user to disable the Flash/EE interrupt.
3
Erase/write command protection.
Set by user to enable the erase and write commands.
Cleared to protect the Flash against the erase/write
command.
2:0
Reserved. Always set these bits to 0.
Table 14. Command Codes in FEECON
Access:
Read and write
Code
0x00 1
0x01 1
0x02 1
0x03 1
0x04 1
0x05 1
0x06 1
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
Command
Null
Single read
Single write
Erase/write
Single verify
Single erase
Mass erase
Reserved
Reserved
Reserved
Reserved
Signature
Protect
Reserved
Reserved
Ping
Description
Idle state.
Load FEEDAT with the 16-bit data. Indexed by FEEADR.
Write FEEDAT at the address pointed by FEEADR. This operation takes 50 μs.
Erase the page indexed by FEEADR and write FEEDAT at the location pointed by FEEADR. This operation takes
approximately 24 ms.
Compare the contents of the location pointed to by FEEADR to the data in FEEDAT. The result of the
comparison is returned in FEESTA Bit 1.
Erase the page indexed by FEEADR.
Erase 30 kB of user space. The 2 kB of kernel are protected. To prevent accidental execution, a command
sequence is required to execute this instruction. See the Command Sequence for Executing a Mass Erase
section.
Reserved.
Reserved.
Reserved.
Reserved.
This command results in a 24-bit LFSR-based signature being generated and loaded into FEESIGN MMR. This
operation takes 16,389 clock cycles.
This command can run only once. The value of FEEPRO is saved and removed only with a mass erase (0x06) or
the key.
Reserved.
Reserved.
No operation; interrupt generated.
1
The FEECON register always reads 0x07 immediately after execution of any of these commands.
Rev. 0 | Page 21 of 100
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