Mode 2, Figure 12-3, Figure 12-3. serial port mode 2 – Maxim Integrated High-Speed Microcontroller User Manual
Page 148
High-Speed Microcontroller User’s Guide
Rev: 062210
148 of 176
Figure 12-3. Serial Port Mode 2
SBUF
DIVIDE
BY 2
D7
LOAD
CLOCK
TRANSMIT SHIFT REGISTER
S0
P3.1
LATCH
TXD
PIN
RECEIVE DATA BUFFER WR
RD
CLOCK
RECEIVE SHIFT
REGISTER
SI
READ
SERIAL
BUFFER
SHIFT
CLOCK
LOAD
SERIAL
BUFFER
LOAD
INTS
SERIAL I/O
C
O
NT
RO
L
SHIFT
T1
FLAG =
SCONx.1
RXD
PIN
SERIAL
INTERRUPT
LDSBUF
RDSBUF
STO
P
START
1
0
STO
P
START
RB8=
SCONx.2
R1
FLAG =
SCONx.0
DIVIDE
BY
16
BIT
DETECTION
DATA BUS
SBUF
RESET
DIVIDE
BY 16
SMOD_0=
PCON.7
OR
SMOD_1=
WDCON.7
D6
D5
D4
D3
D2
D1
D0
D7
D5
D4
D3
D2
D1
D0
D6
OSC/2=
CRYSTAL/2
1
0
D8
TB8 =
SCONx.3
D8
TRANSMIT TIMING
LDSBUF
SHIFT
RECEIVE TIMING
BIT DETECTOR
SAMPLING
SHIFT
TI
RI
TXD
D0
D1
D2
D3
D4
D5
D6 D7
STOP
START
RXD
D0
D1
D2
D3
D4
D5
D6
D7
START
STOP
TB8
RB8