56F8335 datasheet(36/160 Pages) FREESCALE

36 / 160 page

56F8335 Technical Data, Rev. 5

Freescale Semiconductor

Preliminary

4.2 Program Map

The Program memory map is located in Table 4-4. The operating mode control bits (MA and MB) in the

Operating Mode Register (OMR) control the Program memory map. At reset, these bits are set as indicated

in Table 4-2.

EXT_BOOT = EMI_MODE = 0 and cannot be changed in the 56F8335 or 56F8135.

After reset, the OMR MA bit can be changed and will have an effect on the P-space memory map, as shown

in Table 4-3. Changing the OMR MB bit will have no effect.

Data Flash

8KB

—

Erase / Program via Flash interface unit and word writes to

CDBW. Data Flash can be read via either CDBR or XDB2,

but not by both simultaneously

Program RAM

4KB

—

None

Data RAM

8KB

None

Program Boot Flash

8KB

Erase / Program via Flash Interface unit and word writes to

CDBW

Table 4-2 OMR MB/MA Value at Reset1

1. Information in shaded areas not applicable to 56F8335/56F8135.

OMR MB =

Flash Secured

State2,3

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 =

EXTBOOT Pin

Chip Operating Mode

Mode 0 – Internal Boot; EMI is configured to use 16 address lines; Flash

Memory is secured; external P-space is not allowed; the EOnCE is disabled

Not valid; cannot boot externally if the Flash is secured and will actually

configure to 00 state

Mode 0 – Internal Boot; EMI is configured to use 16 address lines

Mode 1 – External Boot; Flash Memory is not secured; EMI configuration is

determined by the state of the EMI_MODE pin

Table 4-3 Changing OMR MA Value During Normal Operation

OMR MA

Chip Operating Mode

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.

Table 4-1 Chip Memory Configurations

On-Chip Memory

56F8335

56F8135

Use Restrictions

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