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MSM80C154S/83C154S/85C154HVS
18
2.3 MSM80C154S Block Diagram
256WORD
×8bit
TH1
PORT 2
P2.0
P2.7
PORT 0
P0.0
P0.7
PCON IOCON
OSC AND TIMING
XTAL1
XTAL2
ALE
PSEN
EA
RESET
PORT 1
P1.0
P1.7
PORT 3
P3.0
P3.7
TL1 TH0 TL0 TMOD TCON IE IP SCON
TIMER/COUNTER 0&1
INTERRUPT
SERIAL IO
SBUF
(T)
SBUF
(R)
T2CON TL2
TIMER/
COUNTER 2
PCH
TH2
RCAP
2L
RCAP
2H
PCL
PCHL PCLL
R/W AMP
RAMDP
PSW
ACC TR2 TR1
BR
ALU
IR AIR
C-ROM
SPECIAL
FUNCTION
REGISTER
ADDRESS
DECODER
PLA
CONTROL SIGNAL SIGNALR/W
DPH
DPL
SP
Figure 2-5 MSM80C154S block diagram