Operation Mode
3-11 C51 Microcontrollers Demo Board User Guide
4119C–8051–3/03
3.2 ISP External Flash Memory Mode
External Flash memory might be programmed using Windows h yper terminal or any ter-
minal able to send HEX files in text mode.
3.2.1 Hardware
Configuration The C51/C251 Demo Board must be connected to the PC com port with the cable c on-
nected to the RS232 connector J10.
The switch must be set as shown on Figure 3-2.
PLCC44 socket and X1 Quartz crystal will be used to program external Flash memory.
X1 must be 11.0592 Mhz and Atmel microcontroller must be plugged into PLCC44
socket.
Figure 3-2. C51/C251 Demo Board Switches Configuration to Program External Flash
Memory.
3.2.2 Terminal
Configuration Use the following configuration for the terminal.
3.2.3 ISP Operation 1. Connect C51/C251 Demo Board to the PC com port with the cable.
2. Run Windows hyper terminal and configure it with the parameter specified i n Fig-
ure 3-3.
J11
PSEN
ALE
ISP1
User Code
10
10
J11
J9
J16
J9
J16
EA
MAP SELECT
ISP2
RS232 Cable to PC
Position don’t care
Position needed
Parameter Value
Bauds 9600
Data bits 8
Stop bits 1
Parity None
Flow control Xon-Xoff