MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 66

• 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: -

2.5.2 Memory Indirect Modes
Memory indirect modes fetch two operands from memory. The BR and bd evaluate the
address of the first operand, intermediate memory pointer (IMP). The value of IMP and the
od evaluates the address of the second operand.
There are three types of memory indirect modes: pre-index, post-index, and index register
suppressed. Xn and its modifiers can be allocated to determine either the address of the IMP
(pre-index) or to the address of the second operand (post-index).
2.5.2.1 MEMORY INDIRECT WITH PREINDEX. The Xn is allocated to determine the
address of the IMP. Figure 2-6 illustrates the memory indirect with pre-indexing mode.
NOTE: S indicates suppressed and A indicates active.
MOTOROLA
BR
PC
PC
PC
PC
An
An
An
An
S
S
S
S
Xn
A
A
A
A
A
A
A
A
A
A
A
A
bd
S
S
A
A
S
S
A
A
S
S
A
A
od
S
A
S
A
S
A
S
A
S
A
S
A
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
Register Indirect
Register Indirect
Register Indirect with Constant Index
Register Indirect with Constant Index
Address Register Indirect with
Variable Index
Address Register Indirect with
Variable Index
Address Register Indirect with
Constant and Variable Index
Address Register Indirect with
Constant and Variable Index
PC Relative with Variable Index
PC Relative with Variable Index
PC Relative with Constant and
Variable Index
PC Relative with Constant and
Variable Index
IMP Addressing Mode
Memory Pointer Directly to Data Operand
Memory Pointer as Base with Displacement
to Data Operand
Memory Pointer Directly to Data Operand
Memory Pointer as Base with Displacement
to Data Operand
Memory Pointer Directly to Data Operand
Memory Pointer as Base with Displacement
to Data Operand
Memory Pointer Directly to Data Operand
Memory Pointer as Base with Displacement
to Data Operand
Memory Pointer Directly to Data Operand
Memory Pointer as Base with Displacement
to Data Operand
Memory Pointer Directly to Data Operand
Memory Pointer as Base with Displacement
to Data Operand
Operand Addressing Mode
Addressing Capabilities
2-25