Maxim Integrated MAXQ610 - Manual (Page 130)

9-5
MAXQ610 User’s Guide
Figure 9-2. USART Mode 1
DIVIDE
BY 4
D7 D6 D5 D4 D3 D2 D1 D0
0 1
LOAD CLOCK
TRANSMIT SHIFT REGISTER
S0 LATCH
RECEIVE DATA BUFFER WR
SBUF
RD
D7 D6 D5 D4 D3 D2 D1 D0
CLOCK
RECEIVE SHIFT REGISTER
SI
RESET
BAUD
CLOCK
LOAD
SERIAL
BUFFER
LOAD
SERIAL I/O
CONTROL
INTS
SHIFT
READ
SERIAL
BUFFER
TI
FLAG =
SCON.1
RI
FLAG =
SCON.0
DIVIDE
BY 16
LDSBUF
RDSBUF
0 1
SBUF
SMOD
RXD
PIN
SYSTEM
CLOCK
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
DIVIDE
BY 16
BIT
DETECTION
TXD
PIN
RB8 =
SCON.2
BAUD-CLOCK
GENERATOR
START STOP
START START
SERIAL
INTERRUPT
DATA BUS
RECEIVE TIMING
BIT DETECTOR
SAMPLING
SHIFT
RI
RXD
STOP START
TRANSMIT TIMING
LDSBUF
SHIFT
TI
TXD
STOP START