Maxim Integrated MAXQ7667 - Manual (Page 159)

8-29 __________________________________________________________________________________________________________
MAXQ7667 User’s Guide
Figure 8-9. UART Mode 2
DIVIDE
BY 2
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
SHIFT
CLOCK
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/2
DIVIDE
BY 16
BIT
DETECTION
UTX
PIN
RB8 =
SCON.2
TB8 =
SCON.3
D
8
S
T
A
R
T
S
T
O
P
D
8
S
T
A
R
T
S
T
O
P
SERIAL
INTERRUPT
DATA BUS
D0 START
START
D1 D2 D3 D4 D5 D6 D7 RB8 STOP
D0 D1 D2 D3 D4 D5 D6 D7 TB8 STOP
RECEIVE TIMING
SHIFT
RI
RXD
BIT DETECTOR
SAMPLING
TRANSMIT TIMING
LDSBUF
SHIFT
TI
TXD