dsp56800 Freescale Semiconductor, Inc, dsp56800 Datasheet - Page 100

• Manufacturer Part Number: dsp56800
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

Address Generation Unit
4.2.3.2
The immediate-short-data operand is located within the instruction operation word. A 6-bit unsigned
positive operand is used for DO and REP instructions, and a 7-bit signed operand is used for an immediate
move to an on-core register instruction. This reference is classified as a program reference. See
Figure 4-11 on page 4-19.
4.2.4
Similar to the direct addressing modes, the absolute addressing modes specify the operand value within the
instruction or instruction-extension words. Unlike the direct modes, these values are not used as the
operands themselves, but are interpreted as absolute data memory addresses for the operand values. The
different absolute addressing modes are shown in Table 4-7.
4-20
Absolute Addressing Modes
Absolute short address — 6 bit
(direct addressing)
I/O short address
(direct addressing)
Absolute address — 16-bit
(extended addressing)
Immediate Short Data: #xx
1.
cations in X memory. When IP-BUS (or PGDB) interface maps these registers outside the
X:$FFC0-X:$FFFF range, they are then accessed with other suitable standard addressing mode.
I/O short addressing mode is used when the peripheral registers are mapped to the last 64 lo-
Addressing Mode:
Absolute
1
— 6 bit
Table 4-7. Addressing Mode — Absolute
DSP56800 Family Manual
Notation in the Instruction Set
Summary
X:<<pp
X:xxxx
X:aa
X:<<$FFE3
Examples
X:$C002
X:$0002
Freescale Semiconductor
X:<$02