Maxim Integrated MAXQ Family - Manual (Page 104)

10-3
MAXQ Family User’s Guide
DIVIDE
BY 12
D7 D6 D5 D4 D3 D2 D1 D0 LOAD CLOCK
OUTPUT SHIFT REGISTER
S0 LATCH
RECEIVE DATA BUFFER WR 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
T1
FLAG =
SCON.1
R1
FLAG =
SCON.0
DIVIDE
BY 4
LDSBUF
RDSBUF
0 1
TRANSMIT TIMING
LDSBUF
SHIFT
RXD
(DATA OUT)
TXD
(DATA CLOCK)
TI
WRITE TO SCON (CLEAR RI)
WRITE TO SBSUF
SBUF
TXD
PIN
SYSTEM
CLOCK
RECEIVE TIMING
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
RXD
PIN
SERIAL
INTERRUPT
DATA BUS
Figure 10-1. UART Mode 0
Maxim Integrated