MC68HC05K0 Datasheet, PDF (29/154 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC05K0 • MC68HC05K1
Section 2. Memory
2.1 Contents
2.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
2.3 Input/Output Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
2.4 RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
2.5 ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
2.6 Personality EPROM (MC68HC05K1 Only). . . . . . . . . . . . . . . .34
2.2 Introduction
The central processor unit (CPU) can address 1 Kbyte of memory space.
The program counter typically advances one address at a time through
the memory, reading the program instructions and data. The read-only
memory (ROM) portion of memory holds the program instructions, fixed
data, user-defined vectors, and interrupt service routines. The
random-access memory (RAM) portion of memory holds variable data.
Input/output (I/O) registers are memory-mapped so that the CPU can
access their locations in the same way that it accesses all other memory
locations.
Figure 2-1 is a memory map of the microcontroller unit (MCU).
MC68HC05K0 • MC68HC05K1 — Rev. 2.0
Memory
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Technical Data