MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 48

• 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: -

2.2.5 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