MEGAWIN
MAKE YOU WIN
MG87FE/L2051/4051/6051
Preliminary, v 1.03
6.2. On-Chip Data RAM
7FH
FFH
Upper128
Accessed by
indirect
addressing
SFRs
accessed by
direct
addressing
30H
20H
1FH
10H
08H
00H
Bit
addressable
Bank3
Bank2
Bank1
Bank0
2FH
1FH
17H
0FH
07H
00H
7FH
Lower128
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
12/56
MEGAWIN [ MEGAWIN TECHNOLOGY CO., LTD ]
