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INTERNAL SPECIFICATIONS
123
D1
WRITE TO SBUF
TXD
TERMINATE TRANSMISSION
TX CLOCK
TI
D2 D3 D4 D5 D6
RX COUNTER RUN
RXD SAMPLE CLOCK
LOAD SBUF
RXD
SHIFT-IN CLOCK
RI or SERR SET
TERMINATE RECEPTION
STOP BIT
STOP BIT
M1·S3
TBBD0
D1 D2 D3 D4 D5 D6 RBBD0
M1·S3
START BIT
START BIT
D7
D7
Figure 4-36 Serial port (mode 3) timing chart