MC68HC708XL36 FREESCALE [Freescale Semiconductor, Inc], MC68HC708XL36 Datasheet - Page 33

• Manufacturer Part Number: MC68HC708XL36
• Description: HCMOS Microcontroller Unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Contents
Introduction
Functional Description
1-ram02_a
MOTOROLA
NOTE:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
This section describes the 1024 bytes of RAM.
Addresses $0050 through $044F are RAM locations. The location of the
stack RAM is programmable. The 16-bit stack pointer allows the stack to
be anywhere in the 64-Kbyte memory space.
For correct operation, the stack pointer must point only to RAM
locations.
Within page 0 are 176 bytes of RAM. Because the location of the stack
RAM is programmable, all page 0 RAM locations can be used for I/O
control and user data or code. When the stack pointer is moved from its
reset location at $00FF, direct addressing mode instructions can access
efficiently all page 0 RAM locations. Page 0 RAM, therefore, provides
ideal locations for frequently accessed global variables.
Before processing an interrupt, the CPU uses five bytes of the stack to
save the contents of the CPU registers.
Freescale Semiconductor, Inc.
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Go to: www.freescale.com
RAM
Random Access Memory
MC68HC708XL36
RAM
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