*
81C55 Timer control for establishing UART Baud Rate
TL7
--
TLO Timer Counter Lower &bit
7 654
321
0
TL7
TH5
-THO
Timer Counter Upper 6-bit
76543
2
1
0
This mode transmits a single-square wave which
the first half of the number of count is high
and remaining is low. (Mode
0)
This mode continually trans~nits
a
Mode
0
type
square wave. (Mode
1
)
This mode transmits an L-pulse (single pulse)
during one clock when finishing the terminal
count. (Mode
2)
This mode continually transmits a Mode
2
type
pulse. (Mode 3)
The
OUT
BD command loads the time constant to the time constant register (Bit
0
to Bit 13). and also loads the mode of timer to
bit
14
and bit 15.
The
IN BD command reads
the
contents of the counter (count data) and
the
mode
bit.
TL6
M2
TL5
M1
TL4
TH5
TL3
TL2
THO TH4
TH2
TL1
TH3
TH1
TLO
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