MC68030CRC25C Freescale Semiconductor, MC68030CRC25C Datasheet - Page 84
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MC68030CRC25C
Manufacturer Part Number
MC68030CRC25C
Description
IC MPU 32BIT ENHANCED 128-PGA
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68030FE20C.pdf
(599 pages)
Specifications of MC68030CRC25C
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
128-PGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
- Current page: 84 of 599
- Download datasheet (23Mb)
2.8.3 Queues
M O T O R O L A
The user can implement queues with the address register indirect with post-
To implement growth of the queue from low to high memory, use:
the unchanged
from high to low memory or from low to high memory. Two registers are
One register, An, contains the
After a "put" operation, the " p u t " address register points to the next available
space in the queue, and the unchanged "get" address register points to the
address register points to the next item to be removed from the queue, and
the queue. This is illustrated as:
increment or predecrement addressing modes. Using a pair of address reg-
isters (two of A0-A6), the user can implement a queue which is filled either
used because queues are pushed from one end and pulled from the other.
next item to be removed from the queue. After a "get" operation, the "get"
In this case, after either a push or pull operation, register An points to the
next available space on the stack. This is illustrated as:
(An)+ to put data into the queue,
(Am)+ to get data from the queue.
GET (Am)+ ~
PUT (An)+ ~
"put"
An - -
address register points to the next available space in
M C 6 8 0 3 0
"put"
U S E R ' S M A N U A L
50"~0M 0F STACK
LAST GET (FREE)
"~0P OE STACK
~:GH MEMORY
LOW MEMORY
HIGH MEMORY
LS' , ' / MEMORY
NEXT GET
LAST PUT
,FREE)
(FREE)
pointer; the other, Am, the "get" pointer.
2 - 3 9
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