56F8355 datasheet(39/172 Pages) FREESCALE

39 / 172 page

Program Map

56F8355 Technical Data, Rev. 17

Freescale Semiconductor

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 VDD at boot up.

Table 4-3 Changing OMR MA Value During Normal Operation

OMR MA

Chip Operating Mode

Use internal P-space memory map configuration

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 11 (MA = 1)

Internal Boot

External Boot

Internal Boot

16-Bit External Address Bus

EMI_MODE = 02, 3

16-Bit External Address Bus

EMI_MODE = 14

20-Bit External Address Bus

P:$1F FFFF

P:$10 0000

External Program Memory5

External Program Memory6

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 Flash7

256KB

Internal Program Flash

128KB

P:$00 FFFF

P:$00 0000

External Program RAM5

COP Reset Address = 00 0002

Boot Location = 00 0000

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