MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 170

• 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: -

Integer Instructions
CAS
CAS2
Operation:
Assembler
Syntax:
Attributes:
Description: CAS compares the effective address operand to the compare operand (Dc).
Condition Codes:
4-66
*.
CAS2 cannot use byte operands.
If the operands are equal, the instruction writes the update operand (Du) to the effective
address operand; otherwise, the instruction writes the effective address operand to the
compare operand (Dc).
CAS2 compares memory operand 1 (Rn1) to compare operand 1 (Dc1). If the oper-
ands are equal, the instruction compares memory operand 2 (Rn2) to compare oper-
and 2 (Dc2). If these operands are also equal, the instruction writes the update
operands (Du1 and Du2) to the memory operands (Rn1 and Rn2). If either comparison
fails, the instruction writes the memory operands (Rn1 and Rn2) to the compare oper-
ands (Dc1 and Dc2).
Both operations access memory using locked or read-modify-write transfer sequences,
providing a means of synchronizing several processors.
X — Not affected.
N — Set if the result is negative; cleared otherwise.
Z — Set if the result is zero; cleared otherwise.
V — Set if an overflow is generated; cleared otherwise.
C — Set if a borrow is generated; cleared otherwise.
—
X
N
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
CAS Destination – Compare Operand
CAS2 Destination 1 – Compare 1
CAS Dc,Du, < ea >
CAS2 Dc1:Dc2,Du1:Du2,(Rn1):(Rn2)
Size = (Byte
Z
Compare and Swap with Operand
If Z, Update Operand
Else Destination
If Z, Destination 2 – Compare 2
If Z, Update 1
Else Destination 1
V
(MC68020, MC68030, MC68040)
C
*
, Word, Long)
Destination 1; Update 2
Compare Operand
Compare 1; Destination 2
Destination
cc;
cc
cc;
Destination 2
Compare 2
CAS2
MOTOROLA
CAS