Maxim Integrated MAXQ610 - Manual (Page 128)

9-3
MAXQ610 User’s Guide
Figure 9-1. USART Mode 0
DIVIDE
BY 12
D7 D6 D5 D4 D3 D2 D1 D0 LOAD CLOCK
OUTPUT SHIFT REGISTER
S0 LATCH
RECEIVE DATA BUFFER WR
SBUF
RD
D7 D6 D5 D4 D3 D2 D1 D0 CLOCK
RECEIVE SHIFT REGISTER
SI
BAUD
CLOCK
SM2 = SCONx.5
LOAD
SERIAL
BUFFER
RECEIVE
BUFFER
LOAD
DATA
CLOCK
SERIAL I/O
CONTROL
INTS
SHIFT
READ
SERIAL
BUFFER
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 SBUF
TRANSMIT TIMING
RECEIVE TIMING
SBUF
TXD
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
RXD
PIN
SERIAL
INTERRUPT
DATA BUS