MC9S12T64 Datasheet, PDF (129/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Module Mapping Control (MMC)
Register Descriptions
ROMHM — Flash EEPROM only in second half of memory map
Write: Once in Normal and Emulation modes and anytime in Special
modes
1 = Disables direct access to the 32K byte Flash EEPROM in
location $0000 – $7FFF in the memory map. In special modes,
the physical location of this 32K byte Flash can still be
accessed through the Program Page window.
0 = The 32K byte Pages $3D(61) and $3E (62) of fixed Flash
EEPROM in location $0000 – $7FFF can be accessed.
ROMON — Enable Flash EEPROM
Write: Once in Normal and Emulation modes and anytime in Special
modes
This bit is used to enable the Flash EEPROM memory in the memory
map.
In Normal Expanded or Emulation modes, the reset state of this bit is
determined the state of the PK7 pin (Port K) during reset. See
Table 24.
1 = Enables the Flash EEPROM in the memory map.
0 = Disables the Flash EEPROM from the memory map.
Table 24 State of ROMON bit after reset
State of ROMON
bit after reset
Normal Expanded
mode
Emulation mode
State of PK7 during reset
PK7=0
PK7=1
0
1
1
0
MOTOROLA
Module Mapping Control (MMC)
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MC9S12T64Revision 1.1.1
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