mc68hc708mp16 Freescale Semiconductor, Inc, mc68hc708mp16 Datasheet - Page 53

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mc68hc708mp16

Manufacturer Part Number
mc68hc708mp16
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet

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Technical Data — MC68HC708MP16
3.1 Contents
3.2 Introduction
3.3 Functional Description
MC68HC708MP16
Freescale Semiconductor
NOTE:
NOTE:
Rev. 3.1
Section 3. Random-Access Memory (RAM)
3.2
3.3
This section describes the 512 bytes of RAM.
Addresses $0050–$024F 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 zero are 160 bytes of RAM. Because the location of the
stack RAM is programmable, all page zero 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 zero RAM locations. Page zero 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.
For M6805 compatibility, the H register is not stacked.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Random-Access Memory (RAM)
Technical Data
53

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