MC68HC711PH8 Motorola, MC68HC711PH8 Datasheet - Page 61

• Manufacturer Part Number: MC68HC711PH8
• Description: High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit
• Manufacturer: Motorola

PH8.DS03/Modes+mem
REG[3:0] — 128-byte register block position
These four bits specify the upper hexadecimal digit of the address for the 128-byte block of internal
registers. The register block is positioned at the beginning of any 4K page in the memory map.
Refer to Table 3-5.
When the memory map has the 128-byte register block mapped at the same location as RAM, the
registers have priority and the RAM is relocated to the memory space immediately following the
register block. This mapping feature keeps all the RAM available for use. Refer to Figure 3-3, which
illustrates the overlap.
MC68HC11PH8
$x000
$x07F
$x080
$x7FF
RAM[3:0]
OPERATING MODES AND ON-CHIP MEMORY
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Register and RAM mapped
to different 4K boundaries.
Table 3-5 RAM and register remapping
Figure 3-3 RAM and register overlap
—this line does not form part of the document—
RAM A
RAM B
$C000Ð$C7FF
$D000Ð$D7FF
$A000Ð$A7FF
$B000Ð$B7FF
$E000Ð$E7FF
$F000Ð$F7FF
$0000Ð$07FF
$1000Ð$17FF
$2000Ð$27FF
$3000Ð$37FF
$4000Ð$47FF
$5000Ð$57FF
$6000Ð$67FF
$7000Ð$77FF
$8000Ð$87FF
$9000Ð$97FF
Location
$x000
$x07F
$x080
$x7FF
$x800
$x87F
REG[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Register and RAM mapped
to the same 4K boundary.
Register block
RAM B
RAM A
$C000Ð$C07F
$D000Ð$D07F
$A000Ð$A07F
$B000Ð$B07F
$E000Ð$E07F
$0000Ð$007F
$1000Ð$107F
$2000Ð$207F
$3000Ð$307F
$4000Ð$407F
$5000Ð$507F
$6000Ð$607F
$7000Ð$707F
$8000Ð$807F
$9000Ð$907F
$F000Ð$F07F
Location
[DS97 v 4.1] 08/Apr/97@13:55
MOTOROLA
TPG
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1
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