Freescale Semiconductor, Inc.
Operating Modes
Table 5-3. Program space Page Index
Page Index 2
(PPAGE bit 2)
Page Index 1
(PPAGE bit 1)
Page Index 0
(PPAGE bit 0)
16K Program space Page
Flash array
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
16K byte Page 0
16K byte Page 1
16K byte Page 2
16K byte Page 3
16K byte Page 4
16K byte Page 5
16K byte Page 6*
16K byte Page 7*
00FEE32K
00FEE32K
01FEE32K
01FEE32K
10FEE32K
10FEE32K
11FEE32K
11FEE32K
* The 16K byte program space page 6 can also be accessed at a fixed
location from $4000 to $7FFF. The 16K byte program space page 7 can
also be accessed at a fixed location from $C000 to $FFFF.
5.5.6 Flash register space expansion
There are four 32K Flash arrays for MC68HC912DG128 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.
Table 5-4. Flash Register space Page Index
Page Index 2 Page Index 1
(PPAGE bit 2) (PPAGE bit 1) (PPAGE bit 0)
Page Index 0
Flash register space Page
Flash array
0
0
1
1
0
1
0
1
X
X
X
X
$00F4-$00F7 Page 0
$00F4-$00F7 Page 1
$00F4-$00F7 Page 2
$00F4-$00F7 Page 3
00FEE32K
01FEE32K
10FEE32K
11FEE32K
Technical Data
MC68HC912DG128 — Rev 3.0
Operating Modes
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