Circuit Diagram - ViewSonic VA502mb-1 Service Manual

Circuit Diagram

P1.0
Port
1
P1.7
P3.0
Port
3
P3.7
P4.0
Port
4
P4.7
TDA7496(U201): The TDA7496L is a stereo 2W+2W class AB power amplifier assembled in the
@ Powerdip 14+3+3 package, specially designed for high quality sound, TV and Monitor
applications. Features of the TDA7496L include linear volume control, Stand-by and mute
functions. The function of each pin and the inside circuit diagram are as follows:
ViewSonic Corporation
Port 1
Latch
ACC
Interrupt
Timer
2
Timer
PSW
0
Timer
1
UART
Port 3
Instruction
Latch
Decoder
&
Sequencer
Bus & Clock
Controller
Port 4
Latch
Oscillator
ALE
XTAL1 XTAL2
B
T1 T2
Stack
Pointer
ALU
SFR RAM
Address
256+1K bytes
RAM & SFR
Reset Block
Power control
RST VCC
PSEN
14
Confidential - Do Not Copy
Port 0
Latch
DPTR
Temp Reg.
PC
Incrementor
Addr. Reg.
64KB
Flash E ROM
4KB
Flash EROM
Port
Port 2
Latch
Vss
P0.0
Port
0
P0.7
P2.0
2
P2.7
VA502mb-1