Memory
Organization
00-7F
RAM, Access it via direct addressing
SFR, Access it via direct addressing
80-FF
80-FF
indirect on-chip RAM,
Access it via indirect addressing
0000-03FF on-chip expanded RAM (1024B),
Access it via MOVX instruction
0000-
off-chip memory, enabled by setting ERAM
Address Space for MPC89x54A RAM
0000-3FFF Program Memory (16KB)
4000-FBFF NonVolatile data memory
shared with ISP program
memory.
ISP program could take
1KB, 2KB or 4KB
depending on OR0[5:4]
Address Space for MPC89x54A Embedded Flash Memory
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
-
Bit-2
Bit-1
SB
Bit-0
ISPAS1
ISPAS0
MOVCL
LOCK
Non-volatile register OR0
7
6
5
4
3
2
1
0
FZWDTCR
OSCDN
HWBS
EN6T
Non-volatile register OR1
MEGAWIN
MPC89x54A Data Sheet
9
MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
