PCA9665D datasheet(8/91 Pages) PHILIPS

8 / 91 page

PCA9665_2

Product data sheet

Rev. 02 — 7 December 2006

8 of 91

NXP Semiconductors

PCA9665

Fm+ parallel bus to I2C-bus controller

7.3.1 Direct registers

7.3.1.1

The Status register, I2CSTA (A1 = 0, A0 = 0)

I2CSTA is an 8-bit read-only register. The two least signiﬁcant bits are always zero. The

six most signiﬁcant bits contain the status code. There are 30 possible status codes.

When I2CSTA contains F8h, it indicates the idle state and therefore no serial interrupt is

requested. All other I2CSTA values correspond to deﬁned states. When each of these

states is entered, a serial interrupt is requested (SI = 1 and INT asserted LOW).

Remark: Data in I2CSTA is valid only when a serial interrupt occurs (SI = 1 and INT

asserted LOW). Reading the register when SI = 0 and INT is HIGH may cause wrong

values to be read.

7.3.1.2

The Indirect Pointer register, INDPTR (A1 = 0, A0 = 0)

INDPTR is an 8-bit write-only register. It contains a pointer to a register in the indirect

address space (IP[2:0]). The value in the register will determine what indirect register will

be accessed when the INDIRECT register is read or written, as deﬁned in Table 4.

7.3.1.3

The I2C-bus Data register, I2CDAT (A1 = 0, A0 = 1)

I2CDAT is an 8-bit read/write register. It contains a byte of serial data to be transmitted or

a byte which has just been received. In master mode, this includes the slave address that

the master wants to send out on the I2C-bus, with the most signiﬁcant bit of the slave

address in the SD7 bit position and the Read/Write bit in the SD0 bit position. The CPU

can read from and write to this 8-bit register while the PCA9665 is not in the process of

shifting a byte. This occurs when PCA9665 is in a deﬁned state and the serial interrupt

ﬂag is set. Data in I2CDAT remains stable as long as SI is set. Whenever the PCA9665

generates an interrupt, the I2CDAT register contains the data byte that was just

transferred on the I2C-bus.

Table 5.

I2CSTA - Status register (A1 = 0, A0 = 0) bit allocation

ST5

ST4

ST3

ST2

ST1

ST0

Table 6.

I2CSTA - Status register (A1 = 0, A0 = 0) bit description

Bit

Symbol

Description

7:2

ST[5:0]

status code corresponding to the different I2C-bus states

1:0

always at zero

Table 7.

INDPTR - Indirect Register Pointer (A1 = 0, A0 = 0) bit allocation

IP2

IP1

IP0

Table 8.

INDPTR - Indirect Pointer register (A1 = 0, A0 = 0) bit description

Bit

Symbol

Description

7:3

reserved; must be written with zeroes

2:0

IP2 to IP0

address of the indirect register

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