Philips CEM2100/00, Руководство по обслуживанию

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Page 260
20. Serial PROM Mode
20.13 Specifying the Erasure Area
T
5CL8
20.13Specifying the Erasure Area
In the flash memory erasing mode, the erasure area of the flash memory is specified by n
−
2 byte data.
The start address of an erasure area is specified by ERASTA, and the end address is specified by ERAEND.
If ERASTA is equal to or smaller than ERAEND, the sector erase (erasure in 4 kbyte units) is executed. Executing
the sector erase while the security program is enabled results in an infinite loop.
If ERASTA is larger than ERAEND, the chip erase (erasure of an entire flash memory area) is executed and the
security program is disabled. Therefore, execute the chip erase (not sector erase) to disable the security program.
Note: When the sector erase is executed for the area containing no flash cell,
T5CL8
stops the UART commu-
nication and enters the halt condition.
Erasure Area Specification Data (n
−
2 byte data)
7 6 5 4 3 2 1 0
ERASTA ERAEND
ERASTA
The start address of the
erasure area
0000:
0001:
0010:
0011:
0100:
0101:
0110:
0111:
1000:
1001:
1010:
1011:
1100:
1101:
1110:
1111: from 0000H
from 1000H
from 2000H
from 3000H
from 4000H
from 5000H
from 6000H
from 7000H
from 8000H
from 9000H
from A000H
from B000H
from C000H
from D000H
from E000H
from F000H
ERAEND
The end address of the
erasure area
0000:
0001:
0010:
0011:
0100:
0101:
0110:
0111:
1000:
1001:
1010:
1011:
1100:
1101:
1110:
1111:
to 0FFFH
to 1FFFH
to 2FFFH
to 3FFFH
to 4FFFH
to 5FFFH
to 6FFFH
to 7FFFH
to 8FFFH
to 9FFFH
to AFFFH
to BFFFH
to CFFFH
to DFFFH
to EFFFH
to FFFFH