MC68HC912DG128A MOTOROLA [Motorola, Inc], MC68HC912DG128A Datasheet - Page 74
MC68HC912DG128A
Manufacturer Part Number
MC68HC912DG128A
Description
microcontroller unit 16BIT DEVICE
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC912DG128A.pdf
(404 pages)
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Flash register
space expansion
Test mode
Program space
expansion
Resource Mapping
MC68HC912DT128A Rev 2.0
74
Page Index 2
(PPAGE bit 2)
Page Index 2
(PPAGE bit
2)
0
0
1
1
1
1
(PPAGE bit 1)
Page Index 1
(PPAGE bit 1)
Page Index 1
0
1
0
1
1
1
* The 16K byte flash in program space page 6 can also be accessed at
a fixed location from $4000 to $7FFF. The 16K byte flash in program
space page 7 can also be accessed at a fixed location from $C000 to
$FFFF.
There are four 32K Flash arrays for MC68HC912DT128A and each
requires a 4-byte register block. A register space window is used to
access one of the four 4-byte blocks and the PPAGE register to map
each one into the window. The register space window is located from
$00F4 to $00F7 after reset. Only two page indices are used to point to
one of the four pages of the register space.
In special mode and for test purposes only, the 128K bytes of Flash
EEPROM for MC68HC912DT128A can be accessed through a test
program space window of 32K bytes. This window replaces the user’s
program space window to be able to access an entire array. In special
mode and with ROMTST bit set in MISC register, a program space is
located from $8000 to $FFFF. Only two page indices are used to point
to one of the four 32K byte arrays. These indices can be viewed as
expanded addresses X16 and X15.
Table 12 Flash Register space Page Index
(PPAGE bit 0)
Page Index 0
Table 11 Program space Page Index
(PPAGE bit 0)
Page Index 0
X
X
X
X
0
1
Resource Mapping
Flash register space Page
16K Program space Page
$00F4-$00F7 Page 0
$00F4-$00F7 Page 1
$00F4-$00F7 Page 2
$00F4-$00F7 Page 3
16K byte Page 6*
16K byte Page 7*
Flash array
Flash array
00FEE32K
01FEE32K
10FEE32K
11FEE32K
11FEE32K
11FEE32K
MOTOROLA
6-mapping
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