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

12-12
Ultra-High-Speed Flash
Microcontroller User’s Guide
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
CONTROL
SHIFT
T1
FLAG =
SCONx.1
RXD
PIN
SERIAL
INTERRUPT
LDSBUF
RDSBUF
STOP START
1 0
STOP
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
Figure 12-3. Serial Port Mode 2
Maxim Integrated