MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 48
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MC68EC000EI20
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
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2.2.5 Address Register Indirect with Predecrement Mode
In the address register indirect with predecrement mode, the operand is in memory. The
effective address field specifies the address register containing the address of the operand
in memory. Before the operand address is used, it is decremented by one, two, or four
depending on the operand size: byte, word, or long word, respectively. Coprocessors may
support decrementing for any operand size up to 255 bytes. If the address register is the
stack pointer and the operand size is byte, the address is decremented by two to keep the
stack pointer aligned to a word boundary.
MOTOROLA
OPERAND LENGTH ( 1, 2, OR 4)
GENERATION:
ASSEMBLER SYNTAX:
EA MODE FIELD:
EA REGISTER FIELD:
NUMBER OF EXTENSION WORDS:
ADDRESS REGISTER
OPERAND POINTER
MEMORY
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
EA = (An)–SIZE
– (An)
100
REG. NO.
0
.
31
31
SIZE
CONTENTS
CONTENTS
OPERAND
POINTS TO
Addressing Capabilities
0
0
2-7
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