MG87FE/L2051/4051/6051
Preliminary, v 1.03
MAKE YOU WIN
6.2.On-Chip Data RAM
7FH
FFH
SFRs
accessed by
Upper128
Accessed by
indirect
direct
addressing
30H
2FH
Bit
addressing
addressable
20H
1FH
10H
7FH
00H
1FH
17H
0FH
Bank3
Bank2
Bank1
Bank0
Lower128
08H
00H
07H
MG87FE/L2051/4051/6051 has internal data RAM that is mapped into three separate segments. They are lower
128 bytes of RAM, upper 128 bytes of RAM and 128 bytes Special Function Register (SFR).
6.2.1 Lower 128 bytes of RAM: (addresses 0x00 to 0x7F) are accessed by either direct or indirect addressing.
6.2.2 Upper 128 bytes of RAM: (addresses 0x80 to 0xFF) are accessed only by indirect addressing (using R0 or
R1).
6.2.3 The Special Function Registers: (addresses 0x80 to 0xFF) are accessed only by direct addressing.
This document information is the intellectual property of Megawin Technology.
© Megawin Technology Co., Ltd. 2009 All rights reserved.
QP-7300-03D
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