W78E51B_05 Datasheet, PDF (6/25 Pages) Winbond – 8-BIT MICROCONTROLLER

5. BLOCK DIAGRAM
W78E51B
P1.0
~
Port
P1.7
1
Port 1
Latch
INT2
INT3
Interrupt
P3.0
~
P3.7
Timer
0
Timer
1
UART
Port
Port 3
3
Latch
ACC
T1
B
T2
PSW
Stack
ALU
Pointer
Instruction
Decoder
&
Sequencer
SFR RAM
Address
128 bytes
RAM & SFR
Port 0
Latch
DPTR
Temp Reg.
PC
Incrementor
Addr. Reg.
P4.0
~
P4.3
Port
4
Port 4
Latch
Bus & Clock
Controller
ROM
Watchdog
Timer
Oscillator
Reset Block
Power control
Port 2
Latch
XTAL1 XTAL2 ^{ALE PSEN} RST
Vcc
Vss
P0.0
Port
0
~
P0.7
Port
2
P2.0
~
P2.7
-6-