MC68EC000EI16 Freescale Semiconductor, MC68EC000EI16 Datasheet - Page 57

• Manufacturer Part Number: MC68EC000EI16
• Description: IC MPU 32BIT 16MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI16

• Processor Type: M680x0 32-Bit
• Speed: 16MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Addressing Capabilities
2.2.14 Program Counter Memory Indirect Postindexed Mode
This mode is similar to the mode described in 2.2.9 Memory Indirect Postindexed Mode ,
but the PC is the base register. Both the operand and operand address are in memory. The
processor calculates an intermediate indirect memory address by adding a base
displacement to the PC contents. The processor accesses a long word at that address and
adds the scaled contents of the index register and the optional outer displacement to yield
the effective address. The value of the PC used in the calculation is the address of the first
extension word. This is a program reference allowed only for reads.
In the syntax for this mode, brackets enclose the values used to calculate the intermediate
memory address. All four user-specified values are optional. The user must supply the
assembler notation ZPC (a zero value PC) to show the PC is not used. This allows the user
to access the program space without using the PC in calculating the effective address. 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.
2-16
GENERATION:
ASSEMBLER SYNTAX:
EA MODE FIELD:
EA REGISTER FIELD:
NUMBER OF EXTENSION WORDS:
PROGRAM COUNTER
BASE DISPLACEMENT
INDEX REGISTER
OPERAND POINTER
INTERMEDIATE
ADDRESS
MEMORY
SCALE
OUTER DISPLACEMENT
MEMORY
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
31
31
31
EA = (bd + PC) + Xn.SIZE*SCALE + od
([bd,PC],Xn.SIZE*SCALE,od)
111
011
1,2,3,4, or 5
SIGN-EXTENDED VALUE
SIGN-EXTENDED VALUE
SIGN-EXTENDED VALUE
SCALE VALUE
31
31
31
31
VALUE AT INDIRECT MEM. ADDRESS IN PROG. SPACE
0
0
0
CONTENTS
CONTENTS
OPERAND
CONTENTS
POINTS TO
X
POINTS TO
+
+
+
MOTOROLA
0
0
0
0