SC16IS740_11 datasheet(42/63 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

42 of 63

NXP Semiconductors

SC16IS740/750/760

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

Table 33 and Table 34 show the bits’ presentation at the subaddress byte for I2C-bus and

SPI interfaces. Bit 0 is not used, bits 2:1 select the channel, bits 6:3 select one of the

UART internal registers. Bit 7 is not used with the I2C-bus interface, but it is used by the

SPI interface to indicate a read or a write operation.

The register read cycle (see Figure 24) commences in a similar manner, with the master

sending a slave address with the direction bit set to ‘write’ with a following subaddress.

Then, in order to reverse the direction of the transfer, the master issues a repeated

START followed again by the device address, but this time with the direction bit set to

‘read’. The data bytes starting at the internal subaddress will be clocked out of the device,

each followed by a master-generated acknowledge. The last byte of the read cycle will be

followed by a negative acknowledge, signalling the end of transfer. The cycle is

terminated by a STOP signal.

White block: host to SC16IS740/750/760

Grey block: SC16IS740/750/760 to host

(1) See Table 33 for additional information.

Fig 23. Master writes to slave

S

SLAVE ADDRESS

002aab047

W

A

REGISTER ADDRESS(1)

A

nDATA

A

P

White block: host to SC16IS740/750/760

Grey block: SC16IS740/750/760 to host

(1) See Table 33 for additional information.

Fig 24. Master read from slave

S

SLAVE ADDRESS

002aab048

W

A

REGISTER ADDRESS(1)

A

NA

P

S

SLAVE ADDRESS

R

A

nDATA

A

LAST DATA

Table 33.

Register address byte (I2C)

Bit

Name

Function

7

-

not used

6:3

A[3:0]

UART’s internal register select

2:1

CH1, CH0

channel select: CH1 = 0, CH0 = 0

Other values are reserved and should not be used.

0

-

not used

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