PCA9665D datasheet(16/91 Pages) PHILIPS

16 / 91 page

PCA9665_2

Product data sheet

Rev. 02 — 7 December 2006

16 of 91

NXP Semiconductors

PCA9665

Fm+ parallel bus to I2C-bus controller

PCA9665 modes

8.1 Conﬁguration modes

Byte mode and Buffered mode are selected using the MODE bit in I2CCON register:

MODE = 0: Byte mode

MODE = 1: Buffered mode

8.1.1 Byte mode

The Byte mode allows communication on a single command basis. Only one speciﬁc

command is executed at a time and the Status Register is updated once this single

command has been performed. A command can be a START, a STOP, a Byte Write, a

Byte Read, and so on.

8.1.2 Buffered mode

The Buffered mode allows several instructions to be executed before an Interrupt is

generated and before the I2CSTA register is updated. This allows the microcontroller to

request a sequence, up to 68 bytes in a single transmission and lets the PCA9665

perform it without having to access the Status Register and the Control Register each time

a single command is performed. The microcontroller can then perform other tasks while

the PCA9665 performs the requested sequence.

The number of bytes that needs to be sent from the internal buffer (Transmitter mode) or

received into the internal buffer (Receiver mode) is deﬁned in the indirectly addressed

I2CCOUNT Register (BC[6:0]). Up to 68 bytes can be sent or received.

8.2 Operating modes

The four operating modes are:

• Master Transmitter

• Master Receiver

• Slave Receiver

• Slave Transmitter

Each mode can be used on a byte basis (Byte mode) or in an up to 68-byte buffer basis

(Buffered mode).

Data transfers in each mode of operation are shown in Figure 7 through Figure 10. These

ﬁgures contain the following abbreviations:

S — START condition

SLA — 7-bit slave address

R — Read bit (HIGH level at SDA)

W — Write bit (LOW level at SDA)

A — Acknowledge bit (LOW level at SDA)

A — Not acknowledge bit (HIGH level at SDA)

Data — 8-bit data byte

PCA9665D Datasheet(PDF) 16 Page - NXP Semiconductors

PCA9665D Datasheet(HTML) 16 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91

Datasheet Download

Link URL