MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 53

• Manufacturer Part Number: MC68EC000EI20
• Description: IC MPU 32BIT 20MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI20

• Processor Type: M680x0 32-Bit
• Speed: 20MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Addressing Capabilities
2.2.10 Memory Indirect Preindexed Mode
In this mode, both the operand and its address are in memory. The processor calculates an
intermediate indirect memory address using a base address register, a base displacement,
and the index operand (Xn.SIZE*SCALE). The processor accesses a long word at this
address and adds the outer displacement to yield the effective address. Both displacements
and the index register contents are sign-extended to 32 bits.
In the syntax for this mode, brackets enclose the values used to calculate the intermediate
memory address. All four user-specified values are optional. Both the base and outer
displacements may be null, word, or long word. When omitting a displacement or
suppressing an element, its value is zero in the effective address calculation.
2-12
BASE DISPLACEMENT
INDEX REGISTER
GENERATION:
ASSEMBLER SYNTAX:
EA MODE FIELD:
EA REGISTER FIELD:
NUMBER OF EXTENSION WORDS:
ADDRESS REGISTER
SCALE
INTERMEDIATE ADDRESS
MEMORY
OPERAND POINTER
MEMORY
OUTER DISPLACEMENT
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
31
31
31
EA = (bd + An) + Xn.SIZE*SCALE + od
([bd, An, Xn.SIZE*SCALE], od)
110
REG. NO.
1,2,3,4, OR 5
SIGN-EXTENDED VALUE
SIGN-EXTENDED VALUE
SIGN-EXTENDED VALUE
.
31
31
31
31
SCALE VALUE
SCALE VALUE
VALUE AT INDIRECT MEMORY ADDRESS
0
0
0
CONTENTS
CONTENTS
CONTENTS
OPERAND
POINTS TO
X
POINTS TO
+
+
+
MOTOROLA
0
0
0
0