MC68HC705C9A_1 Datasheet, PDF (34/157 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification _RAM
2.3 RAM
The main user RAM consists of 176 bytes at $0050–$00FF. This RAM
area is always present in the memory map and includes a 64-byte stack
area. The stack pointer can access 64 bytes of RAM in the range $00FF
down to $00C0.
NOTE:
Using the stack area for data storage or temporary work locations
requires care to prevent it from being overwritten due to stacking from an
interrupt or subroutine call.
In MC68HC05C9A configuration, two additional RAM areas are
available at $0020–$004F (48 bytes) and $0100–$017F (128 bytes)
(see Figure 2-1 and Figure 2-2.) These may be accessed at any time
by setting the RAM0 and RAM1 bits, respectively, in the C9A option
register. Refer to 1.6 Software-Programmable Options
(MC68HC05C9A Mode Only) for additional information.
MC68HC705C9A — Rev. 2.0
Memory
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