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Rabbit 6000 User’s Manual
digi.com
66
5.3.5 Separate Instruction and Data Space
To make better use of the 64 KB of logical space, an option is provided to map code and data accesses in
the same address space to separate devices. This is accomplished by enabling the inversion of A16 and the
most-significant bit of the bank select bits for accesses in the root and data segments. Careful use of these
features allows both code and data to separately use up to 64 KB of logical memory.
The RAM segment register (RAMSR) provides a shortcut for updating code by accessing it as data. It pro-
vides a “window” that uses the instruction address decoding when read or written as data. This mapping
will only occur when the RAMSR is within the root or data segments; the RAMSR will be ignored if it is
mapped to the stack segment or XPC window.
ORG
0000h
XOR
A
; a <= 00000000
XOR
A
LD
H, A
; h <= 00000000
LD
H, A
SCF
SCF
RLA
; a <= 00000001
RLA
; a <= 00000010
LD
B, A
; b <= 00000010
LD
B, A
SCF
SCF
ADC
A, B
; a <= 00000101
ADC
A, B
; a <= 00000111
ADD
A, A
; a <= 00001110
ADD
A, A
; a <= 00011100
SCF
SCF
ADC
A, H
; a <= 00011101
ADC
A, H
LD
L, A
; l <= 00011101
LD
L, A
IOI
; two IOIs same as one
IOI
LD
(HL), B
; MACR <= 00000010
LD
(HL), B
; dummy memory write (no /WE
NOP
; required delay to start
NOP
; up the 16-bit bus
Summary of Contents for 6000
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Page 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
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Page 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...