Freescale Semiconductor, Inc.
Advance Information — 68HC(9)12D60
Section 10. ROM
10.1 Contents
10.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
10.3 ROM Array . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
10.2 Introduction
The 68HC12D60 contains 60 Kbytes of read-only memory (ROM). The
ROM array is arranged in a 16-bit configuration and may be read as
either bytes, aligned words or misaligned words. Access time is one bus
cycle for byte and aligned word access and two bus cycles for
misaligned word operations.
10.3 ROM Array
The ROM is made of a 28K byte array mapped from $1000 to $7FFF and
of a 32 K byte array mapped from $8000 to $FFFF at reset. The
MAPROM bit in the MISC register allows the swapping of the two arrays.
ROMON28 and ROMON32 enable or disable the ROM module.
68HC(9)12D60 — Rev 4.0
MOTOROLA
Advance Information
ROM
133
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA [ MOTOROLA ]
