Maxim Integrated High-Speed Microcontroller - Manual (Page 144)

High-Speed Microcontroller User’s Guide
Rev: 062210 144 of 176
Figure 12-1. Serial Port Mode 0
DIVIDE
BY 12
D7 D6 D5 D4 D3 D2 D1 D0 LOAD CLO
C
K
OUTPUT SHIFT REGISTER
S0
P3.0
LATCH
RXD
PIN
RECEIVE DATA BUFFER WR RD
D7 D6 D5 D4 D3 D2 D1 D0
CLO
C
K
RECEIVE SHIFT REGISTER
SI
READ
SERIAL
BUFFER
BAUD
CLOCK
LOAD
SERIAL
BUFFER
RECEIVE
BUFFER
LOAD
DATA
CLOCK
INTS
SERIAL I/O CO
NTR
O
L
SHIFT
R1
FLAG =
SCONx.0
T1
FLAG =
SCONx.1
SERIAL
INTERRUPT
DIVIDE
BY 4
LDSBUF
RDSBUF
TRANSMIT TIMING
LDSBUF
SHIFT
WRITE TO SBUF
RXD
(DATA OUT)
D0 D1 D2 D3 D4 D5 D6 D7
TXD
(DATA CLOCK)
TI
RECEIVE TIMING
RDSBUF
SHIFT
WRITE TO SCON (CLEAR RI)
RXD
(DATA IN)
TXD
(DATA CLOCK)
RI
D0 D1 D2 D3 D4 D5 D6 D7
SBUF
OSC
0 1
DATA BUS
SM2=
SCONx.5
TXD
PIN