mg82fel308 Megawin Technology, mg82fel308 Datasheet - Page 22

• Manufacturer Part Number: mg82fel308
• Description: A Single-chip Microcontroller Based On A High Performance 1-t Architecture 80c51
• Manufacturer: Megawin Technology

MG82FE(L)308/316
MEGAWIN
Preliminary, v 0.04
MAKE YOU WIN
8.3. On-chip expanded RAM (XRAM)
To access the on-chip expanded RAM (XRAM), refer to Fig 8-1, the 256 bytes of XRAM (0000H to 00FFH) are
indirectly accessed by move external instruction, “MOVX @Ri” and “MOVX @DPTR”. For KEIL-C51 compiler, to
assign the variables to be located at XRAM, the “pdata” or “xdata” definition should be used. After being
compiled, the variables declared by “pdata” and “xdata” will become the memories accessed by “MOVX @Ri”
and “MOVX @DPTR”, respectively. Thus the MG82FE(L)308/316 hardware can access them correctly.
This document information is the intellectual property of Megawin Technology.
© Megawin Technology Co., Ltd. 2009 All rights reserved.
QP-7300-03D
22/84