mc68hc705k1 Freescale Semiconductor, Inc, mc68hc705k1 Datasheet - Page 26
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mc68hc705k1
Manufacturer Part Number
mc68hc705k1
Description
Hcmos Microcontroller Unit
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC705K1.pdf
(140 pages)
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Memory
2.4 Input/Output Section
2.5 Random-Access Memory (RAM)
Technical Data
NOTE:
The first 32 addresses of the memory space, $0001–$001F, are the I/O
section. These are the addresses of the I/O control registers, status
registers, and data registers. See
The 32 addresses from $00E0 to $00FF serve as both the user RAM and
the stack RAM. The CPU uses five RAM bytes to save all CPU register
contents before processing an interrupt. During a subroutine call, the
CPU uses two bytes to store the return address. The stack pointer
decrements during pushes and increments during pulls.
Be careful when using nested subroutines or multiple interrupt levels.
The CPU may overwrite data in the RAM during a subroutine or during
the interrupt stacking operation.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
Memory
Figure
2-2.
MC68HC705K1 — Rev. 2.0
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