V-Tec AT16/C5 Dokumentacja Strona 9

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Si2400
Rev. 1.3 9
Figure 2. Asynchronous UART Serial Interface Timing Diagram
Table 8. Switching Characteristics
(V
D
= 3.0 to 3.6 V or 4.75 to 5.25 V, T
A
= 0 to 70°C for K-Grade, T
A
= –40 to 85°C for B-Grade)
Parameter Symbol Min Typ Max Unit
CLKOUT Output Clock Frequency 2.4576 39.3216 MHz
Baud Rate Accuracy t
bd
–1 1 %
Start Bit to CTS
t
sbc
—1/(2
z
Baud Rate) ns
CTS
Active to Start Bit t
csb
10 ns
RESET
to RESET t
rs
5.0 ms
RESET
Rise Time t
rs2
100 ns
RESET
to TXD t
rs3
3—ms
Note: All timing is referenced to the 50% level of the waveform. Input test levels are V
IH
=V
D
– 0.4 V, V
IL
=0.4V
Receive Timing
Start
RXD
RXD
8-Bit Data
Mode (Default)
9-Bit Data
Mode
StopD0 D1 D2 D3 D4 D5 D6 D7
Start StopD0 D1 D2 D3 D4 D5 D6 D7 D8
t
csb
t
sbc
CTS
Transmit Timing
Start
Start
TXD
TXD
8-Bit Data
Mode (Default)
9-Bit Data
Mode
Stop
StopD0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7 D8
Note: Baud rates (programmed through register SE0) are as follows: 300,1200, 2400, 9600, 19200,
230400, 245760, and 307200 Hz.
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