Datasheet

Resource Mapping
Memory Maps
MC9S12DP256 — Revision 1.1
Resource Mapping
ROMHM — Flash EEPROM only in second half of memory map
1 = Disables direct access to the 16K byte Flash EEPROM in
location $4000 – $7FFF in the memory map. The physical
location of this 16K byte Flash can still be accessed through
the Program Page window.
0 = The 16K byte Page $3E (62) of fixed Flash EEPROM in location
$4000 – $7FFF can be accessed.
ROMON — Enable Flash EEPROM
This bit is used to enable the Flash EEPROM memory in the memory
map. In expanded modes, the reset state of this bit is determined by
the state of the port K bit 7 pin during reset.
Normal and Emulation: Write once.
Special: Write anytime.
1 = Enables the Flash EEPROM in the memory map.
0 = Disables the Flash EEPROM from the memory map.
Memory Maps
The following diagrams illustrate the memory map for each mode of
operation immediately after reset.
Table 20 EXSTR Stretch Bit Definition
Stretch bit
EXSTR1
Stretch bit
EXSTR0
Number of E Clocks
Stretched
00 0
01 1
10 2
11 3
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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Go to: www.freescale.com
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