Memory
Organization
00-7F
80-FF
80-FF
00-FF
00-
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 (256B),
Access it via
MOVX
instruction
off-chip memory, enabled by setting
ERAM=1
FZWDTCR
MEGAWIN
00
Bits-7
0000
7
Address Space for MPC89x51A embedded Flash memory
Bits-6
Bits-5
Bits-4
Bits-3
ISPAS1
ISPAS0
-
Non-volatile register OR0
Bits-2
MOVCL
Bits-1
SB
Bits-0
LOCK
80
7F
1000
0FFF
6
Address Space for MPC89x51A RAM
FF
0000-0FFF
Program Memory (4KB)
1000-3BFF
NonVolatile data memory
shared with
ISP
program
memory.
ISP program could take
1KB, 2KB or 4KB
depending on
OR0[5:4]
3BFF
5
4
3
2
1
HWBS
0
EN6T
OSCDN
Non-volatile register OR1
MPC89x51A Data Sheet
9
MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
