ADUC7027_15 Datasheet, PDF (53/104 Pages) Analog Devices – Precision Analog Microcontroller, 12-Bit Analog I/O, ARM7TDMI MCU

Data Sheet
Table 35. FEECON Register
Name
Address
FEECON
0xFFFFF808
Default Value
0x07
Access
R/W
FEECON is an 8-bit command register. The commands are
described in Table 36.
Table 36. Command Codes in FEECON
Code Command Description
0x00¹ Null
Idle state.
0x01¹ Single read Load FEEDAT with the 16-bit data.
Indexed by FEEADR.
0x02¹ Single write Write FEEDAT at the address pointed to
by FEEADR. This operation takes 50 µs.
0x03¹ Erase/write
Erase the page indexed by FEEADR and
write FEEDAT at the location pointed by
FEEADR. This operation takes approxi-
mately 24 ms.
0x04¹ Single verify
Compare the contents of the location
pointed by FEEADR to the data in
FEEDAT. The result of the comparison is
returned in FEESTA, Bit 1.
0x05¹ Single erase Erase the page indexed by FEEADR.
0x06¹ Mass erase
Erase 62 kB of user space. The 2 kB of
kernel are protected. This operation
takes 2.48 sec. To prevent accidental
execution, a command sequence is
required to execute this instruction.
See the Command Sequence for
Executing a Mass Erase section.
0x07 Reserved
Reserved.
0x08 Reserved
Reserved.
0x09 Reserved
Reserved.
0x0A Reserved
Reserved.
0x0B Signature
Give a signature of the 64 kB of Flash/EE
in the 24-bit FEESIGN MMR. This
operation takes 32,778 clock cycles.
0x0C Protect
This command can run only once. The
value of FEEPRO is saved and removed
only with a mass erase (0x06) of the key.
0x0D Reserved
Reserved.
0x0E Reserved
Reserved.
0x0F Ping
No operation; interrupt generated.
1 _{The FEECON register always reads 0x07 immediately after execution of any}
of these commands.
ADuC7019/20/21/22/24/25/26/27/28/29
Table 37. FEEDAT Register
Name
Address
FEEDAT
0xFFFFF80C
1 _{X = 0, 1, 2, or 3.}
Default Value
0xXXXX¹
FEEDAT is a 16-bit data register.
Access
R/W
Table 38. FEEADR Register
Name
Address
FEEADR
0xFFFFF810
Default Value
0x0000
FEEADR is another 16-bit address register.
Access
R/W
Table 39. FEESIGN Register
Name
Address
FEESIGN
0xFFFFF818
Default Value
0xFFFFFF
FEESIGN is a 24-bit code signature.
Access
R
Table 40. FEEPRO Register
Name
Address
FEEPRO
0xFFFFF81C
Default Value
0x00000000
Access
R/W
FEEPRO MMR provides protection following a subsequent
reset of the MMR. It requires a software key (see Table 42).
Table 41. FEEHIDE Register
Name
Address
FEEHIDE
0xFFFFF820
Default Value
0xFFFFFFFF
Access
R/W
FEEHIDE MMR provides immediate protection. It does not
require any software key. Note that the protection settings in
FEEHIDE are cleared by a reset (see Table 42).
Table 42. FEEPRO and FEEHIDE MMR Bit Designations
Bit
Description
31
Read protection. Cleared by user to protect all code.
Set by user to allow reading the code.
30:0 Write protection for Page 123 to Page 120, Page 119
to Page 116, and Page 0 to Page 3. Cleared by user to
protect the pages from writing. Set by user to allow
writing the pages.
Command Sequence for Executing a Mass Erase
FEEDAT=0x3CFF;
FEEADR = 0xFFC3;
FEEMOD= FEEMOD|0x8;
FEECON=0x06;
//Erase key enable
//Mass erase command
Rev. F | Page 53 of 104