Maxim Integrated MAXQ7667 - Manual (Page 156)

__________________________________________________________________________________________________________ 8-26
MAXQ7667 User’s Guide
Figure 8-7. UART Mode 0
DIVIDE
BY 12
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
L
O
A
D
C
L
O
C
K
OUTPUT 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
CLOCK
RECEIVE SHIFT REGISTER
SI
BAUD
CLOCK
LOAD
SERIAL
BUFFER
RECEIVE
BUFFER
DATA
CLOCK
SERIAL I/O
CONTROL
IN
T
S
SHIFT
READ
SERIAL
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 SBSUF0
TRANSMIT TIMING
RECEIVE TIMING
SBUF
UTX
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
URX
PIN
SERIAL
INTERRUPT
DATA BUS