PC87307VUL National Semiconductor, PC87307VUL Datasheet - Page 196
PC87307VUL
Manufacturer Part Number
PC87307VUL
Description
PC87307/PC97307 Plug and Play Compatible and PC97 Compliant SuperI/O
Manufacturer
National Semiconductor
Datasheet
1.PC87307VUL.pdf
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13.3.5 Transmitter Timing
Notes:
1. See write cycle timing in Figure 13-4.
2. See read cycle timing in Figure 13-3.
IRTX
Serial
Out
(SOUT)
Interrupt
(THRE)
WR
(WR THR)
Note 1
RD
(RD IIR)
Note 2
t
t
t
t
t
t
IRTXW
HR
IR
IRS
SI
STI
Symbol
a. Not tested. Guaranteed by design.
IRTX Pulse Width
Delay from WR (WR THR) to Reset IRQ
Delay from RD (RD IIR) to Reset IRQ (THRE)
Delay from Initial IRQ Reset to Transmit Start
Delay from Initial Write to IRQ
Delay from Start Bit to IRQ (THRE)
t
HR
a
t
t
IRS
SI
Parameter
t
START
IRTXW
FIGURE 13-7. Transmitter Timing
TABLE 13-39. Transmitter Timing
a
Device Description
a
DATA (5-8)
t
HR
196
a
PARITY
1.6 sec
STOP (1-2) START
Min
16
8
t
Max
3
STI
40
55
24
24
/
8
16
Baud Output Cycles
Baud Output Cycles
Baud Output Cycles
Baud Output Cycles
nsec
nsec
Unit
t
IR
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