MC56F8345 Freescale Semiconductor, Inc, MC56F8345 Datasheet - Page 40

• Manufacturer Part Number: MC56F8345
• Description: 56f8300 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

After reset, the OMR MA bit can be changed and will have an effect on the P-space memory map, as shown
in
Table 4-4
used, since the EMI pins are not provided in the package; therefore, only the Mode 0 column is relevant.
Note: Program RAM is NOT available on the 56F8145 device.
40
1. Setting this bit can cause unpredictable results and is not recommended, since the EMI is not functional in this package.
Table
1. Information in shaded areas not applicable to 56F8345/56F8145.
2. This bit is only configured at reset. If the Flash secured state changes, this will not be reflected in MB until the next reset.
3. Changing MB in software will not affect Flash memory security.
OMR MA
Flash Secured
OMR MB =
1
State
0
1
4-3. Changing the OMR MB bit will have no effect.
shows the memory map options of the 56F8345/56F8145. The two right columns cannot be
1
2,3
Table 4-3 Changing OMR MA Value During Normal Operation
Use internal P-space memory map configuration
Use external P-space memory map configuration – If MB = 0 at reset, changing this bit has no effect.
EXTBOOT Pin
Table 4-2 OMR MB/MA Value at Reset
OMR MA =
1
Mode 1 – External Boot; Flash Memory is not secured; EMI configuration is
determined by the state of the EMI_MODE pin
56F8345 Technical Data, Rev. 17
Chip Operating Mode
Chip Operating Mode
1
(Continued)
Freescale Semiconductor
Preliminary