SC16IS740_11 datasheet(11/63 Pages) NXP

Part #	SC16IS740

Description	Single UART with I2C-bus/SPI interface, 64 bytes of transmit and receive FIFOs

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Manufacturer	NXP [NXP Semiconductors]

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SC16IS740_750_760

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Product data sheet

Rev. 7 — 9 June 2011

11 of 63

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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