User guide

34
User Guide V1.10
RESET
XTAL1
XTAL2
GND
EA/Vpp
C1
C2
XT1
Vcc
J1
C3
Vcc
Philips
P89C51Rx+ or
P89C51Rx2
Microcontroller
Active High
RESET Circuit
PROG-TXD
PROG-RXD
PROG-RESET
PROG-GROUND
RXD
TXD
P3.1
P3.0
U1
C4
USER-INPUT *
P2.7
PSEN
ALE
N/C
PROG-PSEN
P1.0-P1.7
P2.0-P2.6
P0
P2
P1
USER
I/O
8
7
8
R1
R2
PROG-ACTIVE
P0.0-P0.7
D1
PROG-VPP
C5
RS-232
Transceiver
R3
U2
User RS-232
Port
D2
J2
TARGET-VCC
PROG-VCC
* Do not connect this pin to ground
P3.2-P3.7
P3
6
ISP Target System Design Guide - Philips Microcontrollers
Figure 29
continued