MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 390
![no-image](/images/manufacturer_photos/0/2/262/freescale_semiconductor_sml.jpg)
MC68EC000EI20
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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68EC000EI20
Manufacturer:
FREESCALE
Quantity:
772
Company:
Part Number:
MC68EC000EI20
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Company:
Part Number:
MC68EC000EI20R
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
- Current page: 390 of 646
- Download datasheet (3Mb)
Floating Point Instructions
FMOVEM
Register List field:
Programming Note: This instruction provides a very useful feature, dynamic register list
5-88
dr field—Specifies the direction of the transfer.
specification, that can significantly enhance system performance. If the calling
conventions used for procedure calls utilize the dynamic register list feature, the
number of floating-point data registers saved and restored can be reduced.
Static list—contains the register select mask. If a register is to be moved, the corre-
sponding bit in the mask is set as shown below; otherwise it is clear.
Dynamic list—contains the integer data register number, rrr, as listed in the following
table:
The format of the dynamic list mask is the same as for the static list and is contained
in the least significant eight bits of the specified main processor data register.
To utilize the dynamic register specification feature of the FMOVEM instruction, both
the calling and the called procedures must be written to communicate information
about register usage. When one procedure calls another, a register mask must be
passed to the called procedure to indicate which registers must not be altered upon
return to the calling procedure. The called procedure then saves only those registers
that are modified and are already in use. Several techniques can be used to utilize this
mechanism, and an example follows.
Mode field—Specifies the type of the register list and addressing mode.
00 — Static register list, predecrement addressing mode.
01 — Dynamic register list, predecrement addressing mode.
10 — Static register list, postincrement or control addressing mode.
11 — Dynamic register list, postincrement or control addressing mode.
0 — Move the listed registers from memory to the floating-point unit.
1 — Move the listed registers from the floating-point unit to memory.
Static, (An) + ,
Static, – (An)
or Control
List Type
Dynamic
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
Move Multiple Floating-Point
FP7
FP0
0
(MC6888X, MC68040)
Data Registers
FP6
FP1
r
FP5
FP2
r
Register List Format
FP4
FP3
r
FP3
FP4
0
FP2
FP5
0
FP1
FP6
0
FMOVEM
FP0
FP7
0
MOTOROLA
Related parts for MC68EC000EI20
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: