Keil MCB251, Руководство пользователя

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8 Chapter 2. Setup
The Monitor EPROM which is supplied in the MCB251 board is configured for
256KB memory. Refer to the 251 or 151 Microcontroller User’s Manual for
more information.
If you use the MCB251 board with an 8051 compatible device, such as the
Intel 151 or Dallas 320, the A17 DIP switch must be OFF.
MAP1, MAP0: Default OFF, OFF
The MAP1 and MAP0 switches select the memory map for the MCB251. The
memory map used on the MCB251 board depends on the setting of the Monitor
DIP switch. The memory for both settings are shown in the following tables.
Monitor Memory Mapping (Monitor DIP Switch is ON)
Map1 Map0 RAM Monitor EPROM UART CS & USER CS
OFF OFF
251 Mode
00:0000h–01: FFFFh
FE:0000h–FF: DFFFh
FF:E800h–FF:FFFFh UART: FF:E400h–FF:E7FFh
USER: FF:E000h–FF:E3FFh
OFF ON illegal illegal illegal
ON OFF illegal illegal illegal
ON ON
8051 Mode
X:0000h–X:DFFFh
C:0000h-C:DFFFh
(von Neumann mapped)
C:E800h–C:FFFFh UART: X:E400h–X:E7FFh
USER: X:E000h–X:E3FFh
(von Neumann mapped)
User Memory Mapping (Monitor DIP Switch is OFF)
Note: DIP Switch 51/151, Page and SRC/D2 must be also OFF
Map1 Map0 RAM User EPROM UART CS & USER CS
OFF OFF
251 Mode
00:0000h–01:FFFFh
FE:0000h–FE:FFFFh
FF:0000h–FF:DFFFh
FF:E800h–FF:FFFFh UART: FF:E400h–FF:E7FFh
USER: FF:E000h–FF:E3FFh
OFF ON
251 Mode
00:0000h–01:FFFFh FE:0000h–FF:DFFFh
FF:E800h–FF:FFFFh UART: FF:E400h–FF:E7FFh
USER: FF:E000h–FF:E3FFh
ON OFF
251 Mode
00:0000h–00:7FFFh 00:8000h–01:FFFFh
FE:0000h–FF:DFFFh
FF:E800h–FF:FFFFh
UART: FF:E400h–FF:E7FFh
USER: FF:E000h–FF:E3FFh
ON ON
8051 Mode
X:0000h–X:DFFFh C:0000h–C:FFFFh UART: X:E400h–X:E7FFh
USER: X:E000h–X:E3FFh
LED: Default ON
The LED switch selects whether or not Port 1 is connected to the 8 LEDs in the
upper right portion of the board. When LED is ON, the LEDs on port 1 are
enabled. When LED is OFF, the LEDs are not connected to port 1. If the
Monitor DIP switch ON and LED is OFF, the Monitor does not modify the port
1 lines on power-up.