SC16IS740 datasheet(11/62 Pages) NXP

Part #	SC16IS740

Description	Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs, IrDA SIR built-in support

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Manufacturer	NXP [NXP Semiconductors]

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SC16IS740_750_760_6

Product data sheet

Rev. 06 — 13 May 2008

11 of 62

NXP Semiconductors

SC16IS740/750/760

Single UART with I2C-bus/SPI interface, 64-byte FIFOs, IrDA SIR

7.2.2 Auto CTS

Figure 10 shows CTS functional timing. The transmitter circuitry checks CTS before

sending the next data byte. When CTS is active, the transmitter sends the next byte. To

stop the transmitter from sending the following byte, CTS must be deasserted before the

middle of the last stop bit that is currently being sent. The auto CTS function reduces

interrupts to the host system. When ﬂow control is enabled, CTS level changes do not

trigger host interrupts because the device automatically controls its own transmitter.

Without auto CTS, the transmitter sends any data present in the transmit FIFO and a

receiver overrun error may result.

7.3 Software ﬂow control

Software ﬂow control is enabled through the enhanced feature register and the Modem

Control Register. Different combinations of software ﬂow control can be enabled by setting

different combinations of EFR[3:0]. Table 3 shows software ﬂow control options.

(1) When CTS is LOW, the transmitter keeps sending serial data out.

(2) When CTS goes HIGH before the middle of the last stop bit of the current character, the transmitter ﬁnishes sending the current

character, but it does not send the next character.

(3) When CTS goes from HIGH to LOW, the transmitter begins sending data again.

Fig 10. CTS functional timing

start

bit 0 to bit 7

stop

TX

CTS

002aab041

start

stop

bit 0 to bit 7

Table 3.

Software ﬂow control options (EFR[3:0])

EFR[3]

EFR[2]

EFR[1]

EFR[0]

TX, RX software ﬂow control

0

X

no transmit ﬂow control

1

0

X

transmit Xon1, Xoff1

0

1

X

transmit Xon2, Xoff2

1

X

transmit Xon1 and Xon2, Xoff1 and Xoff2

X

0

no receive ﬂow control

X

1

0

receiver compares Xon1, Xoff1

X

0

1

receiver compares Xon2, Xoff2

1011transmit Xon1, Xoff1

receiver compares Xon1 or Xon2, Xoff1 or Xoff2

0111transmit Xon2, Xoff2

receiver compares Xon1 or Xon2, Xoff1 or Xoff2

1111transmit Xon1 and Xon2, Xoff1 and Xoff2

receiver compares Xon1 and Xon2, Xoff1 and Xoff2

0011no transmit ﬂow control

receiver compares Xon1 and Xon2, Xoff1 and Xoff2

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