MC68HC912DG128A MOTOROLA [Motorola, Inc], MC68HC912DG128A Datasheet - Page 78
MC68HC912DG128A
Manufacturer Part Number
MC68HC912DG128A
Description
microcontroller unit 16BIT DEVICE
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC912DG128A.pdf
(404 pages)
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Resource Mapping
MC68HC912DT128A Rev 2.0
78
RFSTR1, RFSTR0 — Register Following Stretch
EXSTR1, EXSTR0 — External Access Stretch
ROMHM — Flash EEPROM only in second Half of Map
The Register-Following space is mapped from $0400 to $07FF after
reset, which is next to the register map. If the registers are moved this
space follows.
This two bit field determines the amount of clock stretch on accesses
to the 1K byte Register Following Map. It is valid regardless of the
state of the NDRF bit. In Single Chip and Peripheral Modes this bit
has no meaning or effect.
This two bit field determines the amount of clock stretch on accesses
to an external address space. In Single Chip and Peripheral Modes
this bit has no meaning or effect.
This bit has no meaning if ROMON bit is clear.
0 = The 16K byte of fixed Flash EEPROM in location $4000-$7FFF
can be accessed.
RFSTR1
EXSTR1
Table 14 RFSTR Stretch Bit Definition
Table 15 EXSTR Stretch Bit Definition
Resource Mapping
0
0
1
1
0
0
1
1
RFSTR0
EXSTR0
0
1
0
1
0
1
0
1
Number of E Clocks
Number of E Clocks
Stretched
Stretched
0
1
2
3
0
1
2
3
MOTOROLA
10-mapping
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