Figure 6-1. uart synchronous mode (mode 0) -4, Figure 6-2. uart asynchronous mode (mode 1) -4 – Maxim Integrated MAXQ7666 User Manual
Page 222
MAXQ7665/MAXQ7666 User’s Guide
6-4
Figure 6-1. UART Synchronous Mode (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
SBUF0
UTX
PIN
SYSTEM
CLOCK
URX
PIN
SERIAL
INTERRUPT
DATA BUS
Figure 6-2. UART Asynchronous Mode (Mode 1)
DIVIDE
BY 4
D7
D6
D5
D4
D3
D2
D1
D0
0
1
LOAD
CLOCK
TRANSMIT SHIFT REGISTER
S0
LATCH
RECEIVE DATA BUFFER
WR
SBUF0
RD
D7
D6
D5
D4
D3
D2
D1
D0
CLOCK
RECEIVE SHIFT REGISTER
SI
RESET
BAUD
CLOCK
LOAD
SERIAL
BUFFER
LOAD
SERIAL I/O
CONTROL
INTS
SHIFT
READ
SERIAL
BUFFER
TI
FLAG =
SCON0.1
RI
FLAG =
SCON0.0
DIVIDE
BY 16
LDSBUF
RDSBUF
0
1
SBUF0
SMOD
URX
PIN
SYSTEM
CLOCK
DIVIDE
BY 16
BIT
DETECTION
UTX
PIN
RB8 =
SCON0.2
BAUD CLOCK
GENERATOR
START
STOP
START
START
SERIAL
INTERRUPT
DATA BUS
Maxim Integrated