Maxim Integrated MAXQ7667 - Manual (Page 160)

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MAXQ7667 User’s Guide
Figure 8-10. UART Mode 3
D0 D1 D2 D3 D4 D5 D6 D7 RB8 STOP
D0 D1 D2 D3 D4 D5 D6 D7 TB8 STOP
RECEIVE TIMING
TRANSMIT TIMING
BAUD
CLOCK
DIVIDE
BY 4
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
0 1
L
O
A
D
C
L
O
C
K
TRANSMIT SHIFT REGISTER
S0 LATCH
RECEIVE DATA BUFFER WR
SBUF
RD
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
C
L
O
C
K
RECEIVE SHIFT REGISTER
SI
RESET
LOAD
SERIAL
BUFFER
LOAD
SERIAL I/O
CONTROL
IN
T
S
SHIFT
READ
SERIAL
BUFFER
TI
FLAG =
SCON.1
RI
FLAG =
SCON.0
DIVIDE
BY 16
LDSBUF
RDSBUF
0 1
SBUF
SMOD
URX
PIN
SYSTEM
CLOCK
DIVIDE
BY 16
BIT
DETECTION
UTX
PIN
BAUD-CLOCK
GENERATOR
S
T
A
R
T
S
T
O
P
S
T
A
R
T
SERIAL
INTERRUPT
DATA BUS
TB8 =
SCON.3
D
8
RB8 =
SCON.2
D
8
S
T
O
P
LDSBUF
SHIFT
TI
TXD
SHIFT
RI
RXD
BIT DETECTOR
SAMPLING
START
START