
MAXQ612/MAXQ622 User’s Guide
Maxim Integrated 9-3
Figure 9-1. USART Mode 0
DIVIDE
BY 12
D7
D6
D5
D4
D3
D2
D1
D0
LOAD
CLOCK
OUTPUT SHIFT REGISTER
S0
LATCH
RECEIVE DATA BUFFER WR
SBUF
RD
D7
D6
D5
D4
D3
D2
D1
D0
CLOCK
RECEIVE SHIFT REGISTER
SI
BAUD
CLOCK
SM2 = SCONx.5
LOAD
SERIAL
BUFFER
RECEIVE
BUFFER
LOAD
DATA
CLOCK
SERIAL I/O
CONTROL
INTS
SHIFT
READ
SERIAL
BUFFER
TI
FLAG =
SCON.1
RI
FLAG =
SCON.0
DIVIDE
BY 4
LDSBUF
RDSBUF
0 1
LDSBUF
SHIFT
RXD
(DATA OUT)
TXD
(DATA CLOCK)
TI
WRITE TO SCON (CLEAR RI)
WRITE TO SBUF
TRANSMIT TIMING
RECEIVE TIMING
SBUF
TXD
PIN
SYSTEM
CLOCK
RDSBUF
SHIFT
RXD
(DATA IN)
TXD
(DATA CLOCK)
RI
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
RXD
PIN
SERIAL
INTERRUPT
DATA BUS
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