MC68030RC33C Freescale Semiconductor, MC68030RC33C Datasheet - Page 99

• Manufacturer Part Number: MC68030RC33C
• Description: IC MPU 32BIT ENHANCED 128-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68030RC33C

• Processor Type: M680x0 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 128-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

3
3-14
3.3 I N T E G E R C O N D I T I O N C O D E S
tain combinations of these bits to control program and system flow.
The first four bits represent a condition resulting from a processor operation.
The X bit is an operand for multiprecision computations; when it is used, it
that use them (refer to Table 3-8 as an example).
The condition codes were developed to meet two criteria:
way. Consistency across instances means that all instances of an instruction
that conditional instructions test the condition codes similarly and provide
the same results, regardless of whether the condition codes are set by a
The CCR portion of the SR contains five bits which indicate the results of
Consistency across instructions means that all instructions that are special
cases of more general instructions affect the condition codes in the same
affect the condition codes in the same way. Consistency across uses means
compare, test, or move instruction.
where:
many integer instructions. Program and system control instructions use cer-
is set to the value of the C bit. The carry bit and the multiprecision extend
bit are separate in the M68000 Family to simplify programming techniques
In the instruction set definitions, the CCR is shown as follows:
• Meaningful Results I
• C o n s i s t e n c y - across instructions, uses, and instances
X (extend)
Z (zero)
V (overflow)
N (negative)
C (carry)
Set to the value of the C bit for arithmetic operations. Otherwise not
affected or set to a specified result.
Set if the most significant bit of the result is set. Cleared otherwise.
Set if the result equals zero. Cleared otherwise.
Set if arithmetic overflow occurs. This implies that the result cannot be
Set if a carry out of the most significant bit of the operand occurs for an
addition. Also set if a borrow occurs in a subtraction. Cleared otherwise.
represented in the operand size. Cleared otherwise.
MC68030 USER'S MANUAL
I
x
no change unless it provides useful information
N
I
Z
I
V
C
I
I
MOTOROLA
I