Intel MCS 51

HARDWARE DESCRIPTION OF THE 8051,8052 AND 80C51
TIMER 1
TIME
OVERFLOW
OVEI
Q
:2
SMOD
SMOD
:0
=1
r
,“..% ,...
1
r-
TCLK - --
“o”’
,.,..
RCLK ----
r
I
RXD
S051INTSRNALBUS
.Ow II
TSB
WRITE
TO —
SSUF
/
w
—--7--A +1$L I
I+%’E;“’”l
RXCLOCK RI LOAD+
-lE&El-
I
IFFH
!’ ,
v
LOAD
SBUF
*
READ
SBUF
*
-
Tx
&LOCl$
n
I WRITE TO S8UF
DATA
SHIFT
‘1
TRANSMIT
-r,
STOPSIT
Figure20.5enalPortMode3.TCLK,RCLK,andTimer2arePresentinthe6052/8032Only.
3-22