MC68EC040RC25 Freescale Semiconductor, MC68EC040RC25 Datasheet - Page 247
![no-image](/images/manufacturer_photos/0/2/262/freescale_semiconductor_sml.jpg)
MC68EC040RC25
Manufacturer Part Number
MC68EC040RC25
Description
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040RC25.pdf
(442 pages)
Specifications of MC68EC040RC25
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
179
Package Type
PGA
Lead Free Status / Rohs Status
Supplier Unconfirmed
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68EC040RC25
Manufacturer:
MOT
Quantity:
1 259
Company:
Part Number:
MC68EC040RC25A
Manufacturer:
MOT
Quantity:
1
Part Number:
MC68EC040RC25A
Manufacturer:
MOTOROLA/摩托罗拉
Quantity:
20 000
- Current page: 247 of 442
- Download datasheet (4Mb)
reset or a restore operation of the null state sets FP7–FP0 to positive, nonsignaling not-a-
numbers (NANs).
9.2.2 Floating-Point Control Register (FPCR)
The FPCR (see Figure 9-2) contains an exception enable (ENABLE) byte that enables or
disables traps for each class of floating-point exceptions and a mode control (MODE) byte
that sets the user-selectable modes. The user can read or write to the FPCR. Motorola
reserves bits 31–16 for future definition; these bits are always read as zero and are
ignored during write operations. The reset function or a restore operation of the null state
clears the FPCR. When cleared, this register provides the IEEE 754 standard defaults.
9.2.2.1 EXCEPTION ENABLE BYTE. Each bit of the ENABLE byte (see Figure 9-2)
corresponds to a floating-point exception class. The user can separately enable traps for
each class of floating-point exceptions.
9.2.2.2 MODE CONTROL BYTE. The MODE byte (see Figure 9-2) controls the user-
selectable rounding modes and precisions. Zeros in this byte select the IEEE 754
standard defaults. The rounding mode (RND) specifies how inexact results are rounded,
and the rounding precision (PREC) selects the boundary for rounding the mantissa.
The processor supports four rounding modes specified by the IEEE 754 standard. These
modes are: round to nearest (RN), round toward zero (RZ), round toward plus infinity
(RP), and round toward minus infinity (RM). The RP and RM modes are directed rounding
modes that are useful in interval arithmetic. Rounding is accomplished through the
intermediate result. Single-precision results are rounded to a 24-bit boundary; double-
precision results are rounded to a 53-bit boundary; and extended-precision results are
rounded to a 64-bit boundary. Table 9-1 lists the encodings for the FPCR.
MOTOROLA
Toward Minus Infinity (RM)
Toward Plus Infinity (RP)
Table 9-1. Floating-Point Control Register Encodings
Toward Zero (RZ)
Rounding Mode
To Nearest (RN)
(RND Field)
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
M68040 USER’S MANUAL
Encoding
0
0
1
1
1
0
0
1
Rounding Precision
(PREC Field)
Extend (X)
Double (D)
Undefined
Single (S)
9- 3
Related parts for MC68EC040RC25
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![MC14560BCP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC12034AP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MPIC2112P](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC14520BCP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC12026AP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC145152P2](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC68HC11A0P](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MCM6726DWJ10](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC44355](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC13282AP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC14519BCP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC14495P1](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![SN74LS796N](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC142100CP](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet:
![MC34014P](/images/manufacturer_photos/0/2/263/freescale_semiconductor__inc_tmb.jpg)
Part Number:
Description:
Manufacturer:
Freescale Semiconductor, Inc
Datasheet: