INTERNAL SPECIFICATIONS
117
SBUF (R)
INPUT SHIFT REG.
INTERNAL BUS
RISTART
START SBUF (T)
INTERNAL BUS
TI
RXD
SAMPLE
LOGIC
1/16
COUTER
TXD
RXD
WRITE
TO SBUF
SERIAL PORT
INTERRUPT
REN
SM2
RECEIVE DATA
NEGLECT LOGIC
SERR
BAUD RATE
CLOCK
1/16
COUTER
BAUD RATE
CLOCK
SMOD
SMOD=1
SMOD=0
1/2
TBB
1/2
XTAL1ยท2
Figure 4-33 Serial port (mode 2)
