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