August 27, 1998
GENERAL RELEASE SPECIFICATION
SECTION 2
MEMORY
This section describes the organization of the MC68HC05SB7 on-chip memory.
2.1
MEMORY MAP
In Normal operating mode, the 48 bytes of I/O, 224 bytes of user RAM and 6144
bytes of user ROM are all active as shown in Figure 2-1. The ROM portion of
memory holds the program instructions, fixed data, user defined vectors, and
interrupt service routines. The RAM portion of memory holds variable data. 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.
$0000
$002F
$0030
$003F
$0040
I/O REGISTERS
48 BYTES
UNIMPLEMENTED
16 BYTES
USER RAM
224 BYTES
$00C0
$00FF
STACK RAM
64 BYTES
$011F
$0120
$05FF
$0600
UNIMPLEMENTED
1248 BYTES
USER ROM
6144 BYTES
$1DFF
$1E00
$1FEF
$1FF0
$1FFF
INTERNAL TEST ROM
496 BYTES
USER VECTORS
16 BYTES
Figure 2-1. MC68HC05SB7 Memory Map
MC68HC05SB7
REV 2.1
MEMORY
MOTOROLA
2-1
FREESCALE [ Freescale ]
