Datasheet

Program Map
56F8355 Technical Data, Rev. 17
Freescale Semiconductor 39
Preliminary
Table 4-4 shows the memory map options of the device. The two right columns cannot be 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 56F8155 device.
1. Cannot be used since MA = EXTBOOT = 0 and the EMI is not available; information in shaded areas not applicable to
56F8355/56F8155.
2. This mode provides maximum compatibility with 56F80x parts while operating externally.
3. “EMI_MODE = 0”, EMI_MODE pin is tied to ground at boot up.
4. “EMI_MODE = 1”, EMI_MODE pin is tied to V
DD
at boot up.
Table 4-3 Changing OMR MA Value During Normal Operation
OMR MA Chip Operating Mode
0 Use internal P-space memory map configuration
1
1
1. Setting this bit can cause unpredictable results and is not recommended, since the EMI is not functional in this package.
Use external P-space memory map configuration – If MB = 0 at reset, changing this bit has no
effect.
Table 4-4 Program Memory Map at Reset
Begin/End
Address
Mode 0 (MA = 0)
Mode 1
1
(MA = 1)
Internal Boot
External Boot
Internal Boot
16-Bit External Address Bus
EMI_MODE = 0
2, 3
16-Bit External Address Bus
EMI_MODE = 1
4
20-Bit External Address Bus
P:$1F FFFF
P:$10 0000
External Program Memory
5
External Program Memory
6
External Program Memory
P:$0F FFFF
P:$03 0000
External Program Memory
COP Reset Address = 02 0002
Boot Location = 02 0000
P:$02 FFFF
P:$02 F800
On-Chip Program RAM
4KB
On-Chip Program RAM
4KB
P:$02 F7FF
P:$02 2000
Reserved
108KB
P:$02 1FFF
P:$02 0000
Boot Flash
16KB
COP Reset Address = 02 0002
Boot Location = 02 0000
Boot Flash
16KB
(Not Used for Boot in this Mode)
P:$01 FFFF
P:$01 0000
Internal Program Flash
7
256KB
Internal Program Flash
128KB
P:$00 FFFF
P:$00 0000
External Program RAM
5
COP Reset Address = 00 0002
Boot Location = 00 0000