MC68EC000EI16 Freescale Semiconductor, MC68EC000EI16 Datasheet - Page 17

• 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: -

Introduction
to effective address, move multiple floating-point data register, and move system control
register instructions do not affect the FPCC. .
1.2.3.2 QUOTIENT BYTE. The quotient byte contains the seven least significant bits of the
unsigned quotient as well as the sign of the entire quotient (see Figure 1-5). The quotient
bits can be used in argument reduction for transcendentals and other functions. For
example, seven bits are more than enough to figure out the quadrant of a circle in which an
operand resides. The quotient bits remain set until the user clears them. .
1.2.3.3 EXCEPTION STATUS BYTE. The EXC byte, illustrated in Figure 1- 6, contains a
bit for each floating-point exception that might have occurred during the most recent
arithmetic instruction or move operation. This byte is cleared at the start of all operations that
generate floating-point exceptions. Operations that do not generate floating-point
exceptions do not clear this byte. An exception handler can use this byte to determine which
floating-point exception(s) caused a trap. .
1-6
SIGNALING NOT-A-NUMBER
OPERAND ERROR
BRANCH/SET ON
UNORDERED
31
OVERFLOW
23
S
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
0
BSUN
15
22
Figure 1-6. FPSR Exception Status Byte
Figure 1-4. FPSR Condition Code Byte
Figure 1-5. FPSR Quotient Code Byte
SNAN
14
28
OPERR
13
27
N
QUOTIENT
OVFL
12
26
Z
UNFL
11
25
I
DZ
10
NAN
24
SIGN OF QUOTIENT
SEVEN LEAST SIGNIFICANT
BITS OF QUOTIENT
INEX2
NOT-A-NUMBER OR UNORDERED
INFINITY
ZERO
NEGATIVE
9
16
INEX1
8
INEXACT DECIMAL
INPUT
INEXACT OPERATION
DIVIDE BY ZERO
UNDERFLOW
MOTOROLA