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Sonic Alert msm85c154hvs User Manual

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MSM80C154S/83C154S/85C154HVS
108
Figure 4-29  Serial port (mode 0) timing chart
D1
WRITE TO SBUF
RXD
TXD
ALE
S4
S5
S6
S1
S2
S3
TERMINATE TRANSMISSION
TI
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
D2
D3
D4
D5
D6
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
WRITE TO SCON
REN·
RI
TXD
ALE
S4
S5
S6
S1
S2
S3
TERMINATE TRANSMISSION
RI
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
S5
S6
S1
S2
S3
S4
READ RXD
LOAD SBUF
SHIFT-IN CLOCK
D7
D0