Maxim Integrated High-Speed Microcontroller - Manual (Page 146)

High-Speed Microcontroller User’s Guide
Rev: 062210 146 of 176
Figure 12-2. Serial Port Mode 1
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
BAUD
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
TIMER 2
OVERFLOW TIMER 1
OVERFLOW
AVAILABLE TO
SERIAL
PO
RT 0
ONLY
1 0
1 0
1 0
TCLK =
T2CON.4
RCLK =
T2CON.5
RECEIVE TIMING
BIT DETECTOR
SAMPLING
SHIFT
RI
RXD
D0 D1 D2 D3 D4 D5 D6 D7
STOP START
TRANSMIT TIMING
LDSBUF
SHIFT
TI
TXD
D0 D1 D2 D3 D4 D5 D6 D7 STOP START