
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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