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Chapter 2 Addressing Modes
Address register relative
base:8[A0]
The bit that is as much away
from bit 0 at the address indi-
base:8[A1]
cated by base as the number of
base:16[A0]
bits indicated by address register
(A0/A1) is the object to be
base:16[A1]
operated on.
However, if the address of the bit
to be operated on exceeds
0FFFF
are ignored and the address
returns to 00000
The address range that can be
specified by address register
(A0/A1) is 8,192 bytes from
base.
SB relative
The bit that is as much away from
bit,base:8[SB]
bit 0 at the address indicated by
bit,base:11[SB]
static base register (SB) plus the
bit,base:16[SB]
value indicated by base (added not
including the sign bits) as the
number of bits indicated by bit is the
object to be operated on.
However, if the address of the bit to
be operated on exceeds 0FFFF
the bits above bit 17 are ignored and
the address returns to 00000
The address ranges that can be
specified by bit,base: 8, bit,base:
11, and bit,base:16 respectively are
32 bytes, 256 bytes, and 8,192
bytes from the static base register
(SB) value.
, the bits above bit 17
16
.
16
16
.
16
base
Register
SB
address
,
base
31
2.5 Bit Instruction Addressing
b7
b0
Bit position
Memory
b7
address
Bit position
b0
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