Atmel C51, User Manual

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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 hyper 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 con-
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 in Fig-
ure 3-3.
J11
PSEN
ALE
ISP1
Use
r Co
d
e
1
0
1 0
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