Datasheet

Chapter 4 Memory
MC9RS08KA2 Series Data Sheet, Rev. 4
34 Freescale Semiconductor
Table 4-5 shows the memory block to be accessed through paging window ($00C0–$00FF).
NOTE
Physical location $0000-$000E is RAM. Physical location $000F is register
X. D[X] register is mapped to address $000E only. The physical RAM in
$000E can be accessing through D[X] register when X register is either $0E
or $CE with PAGESEL is $00.
When PAGESEL register is $00, paging window is mapped to the first page
($00-$3F). Paged location $00C0–$00CE is mapped to physical location
$0000-$000E, i.e., RAM. Paged location $00CF is mapped to register X.
Therefore, accessing address $CE returns the physical RAM content in
$000E, accessing address $000E returns D[X] register content.
14-bit memory address
Start address of memory block selected 000000
AD[13:6]
Figure 4-6. Memory Block Boundary Selector
Table 4-5. Paging Window for $00C0–$00FF
Page Memory Address
$00 $0000–$003F
$01 $0040–$007F
$02 $0080–$00BF
$03 $00C0–$00FF
$04 $0100–$013F
.
.
.
.
.
.
$FE $3F80–$3FBF
$FF $3FC0–$3FFF