+5V
O 1+1 f , |
13 3 pF ' |
1 l |
' Ucc |
lOuF |
1 |
R3 t |
1 f 1 -1- Cl |
10k
lOOnF
Ucc
IC1
89C1051
XTAL1 |
+P1.0 |
-Pl.l | |
PI.2 | |
PI.3 | |
PI. 4 | |
XTAL2 |
PI.5 |
PI.6 | |
PESET |
PI.7 |
RXD/P3.0 | |
Vcc |
TXD/P3.1 |
!IHT0/P3.2 | |
!IHT1/P3.3 | |
T0/P3.4 | |
T1/P3.S | |
Gnd |
P3.7 |
V
1
IC2
24C04
fiO T7,-i r | ||
1 i i |
1 i— i— i— |
4U V L* L Ł1 TS/UP Ł2 SCI 3nd SDA |
Ucc
O
RS232
R1 | ||
lk |
R2
lk
CON2
-iio
— Keyboard