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MSM80C154S/83C154S/85C154HVS
20
2.5 MSM85C154HVS 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
D0 ... D7
EXTERNAL
ROM
16KWORD
×8bit
A0
A13
SOCKET
PORT 2 PORT 0 PCON IOCON
OSC AND TIMING
PORT 1 PORT 3
Figure 2-7 MSM85C154HVS block diagram