PIC18F44J10-ESLASHSP datasheet(157/358 Pages) MICROCHIP

157 / 358 page

Preliminary

DS39682C-page 155

PIC18F45J10 FAMILY

15.4

I2C Mode

The MSSP module in I2C mode fully implements all

master and slave functions (including general call

support) and provides interrupts on Start and Stop bits

in hardware to determine a free bus (multi-master

function). The MSSP module implements the standard

mode specifications as well as 7-bit and 10-bit

addressing.

Two pins are used for data transfer:

• Serial clock (SCLx) – RC3/SCK1/SCL1 or

RD0/PSP0/SCK2/SCL2

• Serial data (SDAx) – RC4/SDI1/SDA1 or

RD1/PSP1/SDI2/SDA2

The user must configure these pins as inputs by setting

the TRISC<4:3> or TRISD<1:0> bits.

FIGURE 15-7:

MSSP BLOCK DIAGRAM

(I2C™ MODE)

15.4.1

REGISTERS

The MSSP module has six registers for I2C operation.

These are:

• MSSP Control Register 1 (SSPxCON1)

• MSSP Control Register 2 (SSPxCON2)

• MSSP Status Register (SSPxSTAT)

• Serial Receive/Transmit Buffer Register

(SSPxBUF)

• MSSP Shift Register (SSPxSR) – Not directly

accessible

• MSSP Address Register (SSPxADD)

SSPxCON1, SSPxCON2 and SSPxSTAT are the

control and status registers in I2C mode operation. The

SSPxCON1 and SSPxCON2 registers are readable and

writable. The lower 6 bits of the SSPxSTAT are

read-only. The upper 2 bits of the SSPxSTAT are

read/write.

SSPxSR is the shift register used for shifting data in or

out. SSPxBUF is the buffer register to which data

bytes are written to or read from.

SSPxADD register holds the slave device address

when the MSSP is configured in I2C Slave mode.

When the MSSP is configured in Master mode, the

lower seven bits of SSPxADD act as the Baud Rate

Generator reload value.

receive

operations,

SSPxSR

and

SSPxBUF

together create a double-buffered receiver. When

SSPxSR receives a complete byte, it is transferred to

SSPxBUF and the SSPxIF interrupt is set.

During

transmission,

the

SSPxBUF

not

double-buffered. A write to SSPxBUF will write to both

SSPxBUF and SSPxSR.

Read

Write

SSPxSR reg

Match Detect

SSPxADD reg

Start and

Stop bit Detect

SSPxBUF reg

Internal

Data Bus

Addr Match

Set, Reset

S, P bits

(SSPxSTAT reg)

RC3 or

RC4 or

Shift

Clock

MSb

LSb

Note: Only port I/O names are used in this diagram for

the sake of brevity. Refer to the text for a full list

of multiplexed functions.

RD0

RD1

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