pc87317vul National Semiconductor Corporation, pc87317vul Datasheet - Page 248

• Manufacturer Part Number: pc87317vul
• Description: Pc87317vul/pc97317vul Superi/o Plug And Play Compatible With Acpi Compliant Controller/extender
• Manufacturer: National Semiconductor Corporation

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14.3.5 Transmitter Timing
Notes:
1. See write cycle timing in FIGURE 14-4 "Microprocessor Write Timing" on page 246.
2. See read cycle timing in FIGURE 14-3 "Microprocessor Read Timing" on page 246.
Serial
Out
(SOUT)
Interrupt
(THRE)
WR
(WR THR)
Note 1
RD
(RD IIR)
Note 2
t
t
t
t
t
HR
IR
IRS
SI
STI
Symbol
1. Not tested. Guaranteed by design.
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
t
t
IRS
SI
Parameter
START
FIGURE 14-7. Transmitter Timing
TABLE 14-46. Transmitter Timing
Device Specifications
1
DATA (5-8)
t
1
HR
248
1
PARITY
Min
16
8
STOP (1-2) START
Max
40
55
24
24
8
t
STI
Baud Output Cycles
Baud Output Cycles
Baud Output Cycles
nsec
nsec
Unit
t
IR