MC68030RC20C Freescale Semiconductor, MC68030RC20C Datasheet - Page 83
MC68030RC20C
Manufacturer Part Number
MC68030RC20C
Description
IC MPU 32BIT ENHANCED 128-PGA
Manufacturer
Freescale Semiconductor
Specifications of MC68030RC20C
Processor Type
M680x0 32-Bit
Speed
20MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
128-PGA
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
20MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
5V
Operating Supply Voltage (max)
5.25V
Operating Supply Voltage (min)
4.75V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
128
Package Type
PGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MC68030RC20C-1F91C
Manufacturer:
ON/安森美
Quantity:
20 000
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2.8.2 User P r o g r a m S t a c k s
To implement stack growth from high to low memory, use:
The user can implement stacks with the address register indirect with post-
For this type of stack, after either a push or a pull operation, register An
points to the top item on the stack. This is illustrated as:
To implement stack growth from low to high memory, use:
memory, aligning the stack pointer on a long-word address significantly
increment and predecrement addressing modes. With address register An
(n =0-6), the user can implement a stack that is filled either from high to low
memory or from low to high memory. Important considerations are:
increases the efficiency of stacking exception frames, subroutine calls and
returns, and other stacking operations.
• Use the predecrement mode to decrement the register before its contents
• Use the postincrement mode to increment the register after its contents
• Maintain the stack pointer correctly when byte, word, and long-word
(An)+ to pull data from the stack.
- ( A n ) to push data on the stack,
- ( A n ) to pull data from the stack.
(An)+ to push data on the stack,
are used as the pointer to the stack.
are used as the pointer to the stack.
items are mixed in these stacks.
An
MC68030 USER'S MANUAL
BOSOM OF STACK
HIGH MEMORY
LOW MEMORY
TOP OF STACK
(FREE)
MOTOROLA
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