Subject:
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Re: 68HC811E2
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 2 Apr 1998 19:06:21 GMT
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Original-From:
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Adrian Susianto <adrian@indonesia.crosswinds+AvoidSpam+.net>
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Viewed:
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1092 times
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...
but I tryed this already and without success. The hbdl loader says "Invalid
CONFIG reg (0xFF) Try again" and when I check the eeprom area with PCBUG11,
it is already there. I think, the E2 has a special protection for the CONFIG
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Hello ...
I'm not mastering the 68HC11 family, but I have made a project to access the
EEPROM and CONFIG register of 68HC811E2.
There is a protection in CONFIG register on every 68HC11 E family.
To access the CONFIG (programming the CONFIG), you must remove the protection
first.
Erasing/Programming the CONFIG register follows the same procedures as that used
for the EEPROM including bulk/byte/row erase.
In normal operating modes, EEPROM and CONFIG registers are protected out of
reset, and the user has 64 E clock cycles to unprotect any of blocks that will
require programming or Erasing. The 68HC811E2 and other E types family use BPROT
register (Block Protect Register) to protect the CONFIG register.
The BPROT register bits can only be cleared during the first 64 E clock cycles
after reset. Once the bit are cleared, the associated EEPROM section and/or the
CONFIG register can be programmed or erased in the normal manner.
BPROT register of M68HC811E2:
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
______________________________________________________________
| | | | | | | | |
$1035 | | | | PTCON | BPRT3 | BPRT2 | BPRT1 | BPRT0 | BPROT register
|_______|_______|_______|_______|_______|_______|_______|_______|
Where:
Bits 7..5 = not implemented
PTCON = Protect CONFIG Register Bit
1 = Programming/Erasure of CONFIG register disabled
0 = Programming/Erasure of CONFIG register allowed
BPRT3..BPRT0 = Block Protect Bits
(see table 1 = Set bit protects a block of EEPROM against programming/erasure
below) 0 = Cleared bit permits programming/erasure of the associated block
____________________________________
| | | |
| Bit | Block Protect | Block Size |
|_______|_______________|____________|
| BPRT0 | $1800-$19FF | 512 Bytes |
| BPRT1 | $1A00-$1BFF | 512 Bytes |
| BPRT2 | $1C00-$1DFF | 512 Bytes |
| BPRT3 | $1E00-$1FFF | 512 Bytes |
|_______|_______________|____________|
Example:
BPROT EQU $1035
ORG $0
LDS #$FF
LDAA #$00 ;Data for clearing BPROT
STAA BPROT ;Clear BPROT
I hope it will help.
If you have any comment, please besure to "CC to" my address. Because I didn't
subscribe to this mailing List.
Best Regards,
Adrian Susianto
mailto:adrian@indonesia.crosswinds.net.id
ICQ : 7725108
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