MC68HC705MC4 Datasheet, PDF (36/99 Pages) Motorola, Inc – Microcontrollers

MC68HC705MC4 Specification Rev. 1.5
SECTION 5
MEMORY
The MC68HC705MC4 utilizes 12 address lines to access an internal memory space of 4K
bytes. This memory space is divided into I/O, RAM, and EPROM/ROM areas.
5.1 USER MODE MEMORY MAP
When the MC68HC05MC4 is in the User Mode, the 48 bytes of I/O, 176 bytes of RAM,
3584 bytes of User ROM, 240 bytes of Self-Check ROM, and 16 bytes of User Vectors
ROM are all active, as shown in Figure 5-1: User Mode Memory Map. When the
MC68HC705MC4 is in the User Mode, the 48 bytes of I/O, 176 bytes of RAM, 3584 bytes
of User EPROM, 240 bytes of Bootstrap ROM, and 16 bytes of User Vectors EPROM are
all active, as shown in Figure 5-1: User Mode Memory Map.
The Mask Option (MOR) and EPROM Programming (EPROG) registers are unique to the
MC68HC705MC4 and are therefore unimplemented in the MC68HC05MC4. The MOR
resides at address $0F00 (first byte of the bootstrap code area) and the EPROG register
resides at $0026.
Section 5: Memory
MOTOROLA
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