User Guide V0.90
21
Philips 8051 FLASH Microcontroller - ISP Notes
RESET
XTAL1
XTAL2
GND
EA
C1
C2
XT1
Vcc
J1
C3
Vcc
Philips
89C51Rx
Microcontroller
Active High
RESET Circuit
PROG-TXD
PROG-RXD
PROG-RESET
PROG-GROUND
PROG-VCC
RXD
TXD
P3.1
P3.0
U1
C4
USER-INPUT
P2.7
PSEN
ALE
N/C
PROG-PSEN
P2.0-P2.6
P3.2-P3.7
P0
P3
P2
USER
I/O
8
6
7
R1
R2
PROG-ACTIVE
P0.0-P0.7
D1
PROG-VPP
C5
RS-232
Transceiver
R3
U2
User RS-232
Port
D2