CM68HC05C4ACFB Motorola / Freescale Semiconductor, CM68HC05C4ACFB Datasheet - Page 26

• Manufacturer Part Number: CM68HC05C4ACFB
• Description: Microcontroller
• Manufacturer: Motorola / Freescale Semiconductor

Memory
2.4 ROM Security Feature
2.5 Random-Access Memory (RAM)
General Release Specification
26
NOTE:
1. No security feature is absolutely secure. However, Motorola’s strategy is to make
A security
help prevent externally reading of code in the ROM. This feature aids in
keeping customer-developed software proprietary.
The user RAM consists of 176 bytes and is used both for general-
purpose RAM and stack area. The stack begins at address $00FF. The
stack pointer can access 64 bytes of RAM in the range $00FF to $00C0.
See
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.
reading or copying the ROM difficult for unauthorized users.
Figure
1
feature has been incorporated into the MC68HC05C4A to
2-1.
Memory
MC68HC05C4A
MOTOROLA
—
Rev. 4.0