Maxim Integrated MAXQ7666 - Manual (Page 228)

MAXQ7665/MAXQ7666 User’s Guide
6-10
Figure 6-3. UART Mode 0
DIVIDE
BY 12
D7 D6 D5 D4 D3 D2 D1 D0 LOAD CLOCK
OUTPUT SHIFT REGISTER
S0 LATCH
RECEIVE DATA BUFFER WR
SBUF0
RD
D7 D6 D5 D4 D3 D2 D1 D0 CLOCK
RECEIVE SHIFT REGISTER
SI
BAUD
CLOCK
LOAD
SERIAL
BUFFER
RECEIVE
BUFFER
DATA
CLOCK
SERIAL I/O
CONTROL
INTS
SHIFT
READ
SERIAL
TI
FLAG =
SCON0.1
RI
FLAG =
SCON0.0
DIVIDE
BY 4
LDSBUF
RDSBUF
0 1
LDSBUF
SHIFT
RXD
(DATA OUT)
TXD
(DATA CLOCK)
TI
WRITE TO SCON0 (CLEAR RI)
WRITE TO SBSUF0
TRANSMIT TIMING
RECEIVE TIMING
SBUF0
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
Maxim Integrated