Atmel C51 Section 3 Operation Mode

Operation Mode
C51 Microcontrollers Demo Board User Guide 3-10
4119C–8051–3/03
Section 3
Operation Mode
3.1 Flash Products
3.1.1 Switch
Configuration To program the on-chip Flash memory, hardware configuration of the chip should be th e following: PSEN = 0, EA = 1 and ALE = 1 or not connected.
On C51/C251 Demo Board, switches must be as shown on Figure 3-2.
Figure 3-1. C51/C251 Demo Board Switches Configuration to use ISP
3.1.2 Running ISP The C51/C251 Demo Board must be connected to a PC com port via the RS 232 cab le
connected to the RS232 connector of C51/C251 Demo Board.
After downloading, you can run code by switching PSEN on J11 to 1 and pressing the
RESET push button.
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