Owner's manual

12-9
SM2=
SCONx.5
DIVIDE-
BY-12
D7 D6 D5 D4 D3 D2 D1 D0 LOAD
CLOCK
OUTPUT SHIFT REGISTER
S0
P3.0
LATCH
RXD
PIN
RECEIVE DATA BUFFER
WRRD
D7 D6 D5 D4 D3 D2 D1 D0
CLOCK
RECEIVE SHIFT REGISTER
SI
READ
SERIAL
BUFFER
BAUD
CLOCK
LOAD
SERIAL
BUFFER
RECEIVE
BUFFER
L
O
AD
DATA
CLOCK
INTS
SERIAL I/O
CONTROL
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)
D
0
D1 D2 D
3
D4 D
5
D
6
D7
TXD
(DATA CLOCK)
TI
RECEIVE TIMING
RDSBUF
SHIFT
WRITE TO SCON
(
CLEAR RI
)
RXD
(DATA IN)
TXD
(DATA CLOCK)
RI
D
0
D1 D2 D
3
D4 D
5
D
6
D7
SBUF
01
DATA BUS
SM2=
SCONx.5
TXD
PIN
SYSTEM CLOCK
Figure 12-1. Serial Port Mode 0
Ultra-High-Speed Flash
Microcontroller User’s Guide
Maxim Integrated