MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 98

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

Resource Mapping
Technical Data
98
CAUTION:
ROMHM — Flash EEPROM only in second Half of Map
Bit must be cleared before reading any of the arrays or registers.
ROMON — Enable Flash EEPROM
This bit has no meaning if ROMON bit is clear.
In special mode and with ROMTST bit set, this bit will allow overlap of
the four 32K Flash arrays and overlap the four 4-byte Flash register
space in the same map space to be able to program all arrays at the
same time.
These bits are used to enable the Flash EEPROM arrays.
0 = The 16K byte of fixed Flash EEPROM in location $4000-$7FFF
1 = Disables direct access to 16K byte Flash EEPROM from
0 = The four 32K Flash arrays are accessed with four pages for
1 = The four 32K Flash arrays coincide in the same space and are
0 = Disables Flash EEPROM in the memory map.
1 = Enables Flash EEPROM in the memory map.
can be accessed.
$4000-$7FFF in the memory map. The physical location of
this16K byte Flash can still be accessed through the Program
Page window.
each.
selected at the same time for programming.
Table 6-6. EXSTR Stretch Bit Definition
EXSTR1
Resource Mapping
0
0
1
1
EXSTR0
0
1
0
1
Number of E Clocks
MC68HC912DT128A — Rev 4.0
Stretched
0
1
2
3
MOTOROLA