MC68HC705K1 Datasheet, PDF (25/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC705K1
Section 2. Memory
2.1 Contents
2.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
2.3 Memory Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
2.4 Input/Output Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
2.5 Random-Access Memory (RAM) . . . . . . . . . . . . . . . . . . . . . . .26
2.6 EPROM/OTPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
2.7 Personality EPROM/OTPROM . . . . . . . . . . . . . . . . . . . . . . . . .30
2.2 Introduction
This section describes the organization of the on-chip memory.
2.3 Memory Map
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 erasable,
programmable read-only memory (EPROM) 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). Refer to
Figure 2-2 for a more detailed memory map of the 32-byte I/O register
section.
MC68HC705K1 — Rev. 2.0
Memory
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Technical Data