MC68HC05P18 Datasheet, PDF (27/144 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Advance Information — MC68HC05P18/MC68HC805P18
Section 2. Memory
2.1 Contents
2.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
2.3 Input/Output and Control Registers . . . . . . . . . . . . . . . . . . . . .27
2.4 RAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
2.5 ROM (MC68HC05P18 Only) . . . . . . . . . . . . . . . . . . . . . . . . . .34
2.6 EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
2.7 User EEPROM (MC68HC805P18 Only). . . . . . . . . . . . . . . . . .34
2.2 Introduction
The MC68HC05P18 and MC68HC805P18 both utilize 14 address lines
to access an internal memory space covering 16 Kbytes. This memory
space is divided into input/output (I/O), random-access memory (RAM),
electrically erasable, programmable read-only memory (EEPROM),
read-only memory (ROM), and boot ROM areas.
Figure 2-1 and Figure 2-2 show user mode memory maps for the
MC68HC05P18 and MC68HC805P18, respectively.
2.3 Input/Output and Control Registers
Figure 2-3 and Figure 2-4 briefly describe the input/output (I/O) and
control registers at locations $0000–$001F. Reading unimplemented
bits will return unknown states, and writing unimplemented bits will be
ignored.
MC68HC(8)05P18 — Rev. 2.0
MOTOROLA
Memory
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Advance Information
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