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SYSTEM CONFIGURATION
19
2.4 MSM83C154S Block Diagram
TH1
P2.0
P2.7
P0.0
P0.7
XTAL1
XTAL2
ALE
PSEN
EA
RESET
P1.0
P1.7
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
256WORD
×8bit
RAMDP
PSW
ACC TR2 TR1
BR
ALU
IR AIR
C-ROM
SPECIAL
FUNCTION
REGISTER
ADDRESS
DECODER
PLA
CONTROL SIGNAL SIGNALR/W
DPH
DPL
SP
SENSE AMP
ROM
16KWORD
×8bit
PORT 2 PORT 0 PCON IOCON
OSC AND TIMING
PORT 1 PORT 3
Figure 2-6 MSM83C154S block diagram