at89lp216-20xi ATMEL Corporation, at89lp216-20xi Datasheet - Page 44

• Manufacturer Part Number: at89lp216-20xi
• Description: At89lp216 8-bit Microcontroller With 2k Bytes Flash
• Manufacturer: ATMEL Corporation

Figure 17-2. Serial Port Mode 1
44
SMOD1
= 0
OVERFLOW
TIMER 1
DATA
SHIFT
TXD
TI
CLOCK
AT89LP216
÷2
TX
BIT DETECTOR SAMPLE TIMES
WRITE TO SBUF
RI
SHIFT
SMOD1
= 1
RXD
START BIT
CLOCK
RX
SEND
RXD
WRITE
SAMPLE
SBUF
D0
TO
TRANSITION
DETECTOR
INTERRUPT
1-TO-0
÷16 RESET
START BIT
÷16
SERIAL
D1
PORT
START
D2
START
RX CLOCK
DETECTOR
D0
÷16
D
CL
“1”
RX CLOCK
S
BIT
Q
D3
D1
ZERO DETECTOR
RX CONTROL
TX CONTROL
READ
SBUF
RI
TI TI
INTERNAL BUS
LOAD
SBUF
D4
SBUF
D2
SHIFT
INTERNAL BUS
INPUT SHIFT REG.
1FFH
SEND
SHIFT
DATA
LOAD
SBUF
SBUF
D5
(9 BITS)
D3
D6
D4
SHIFT
D7
D5
D6
TXD
STOP BIT
D7
STOP BIT
3621B–MICRO–11/07