PIC16F87 datasheet(96/214 Pages) MICROCHIP

96 / 214 page

PIC16F87/88

DS30487B-page 94

Preliminary

 2003 Microchip Technology Inc.

TABLE 10-2:

DATA TRANSFER RECEIVED BYTE ACTIONS

FIGURE 10-6:

I2C WAVEFORMS FOR RECEPTION (7-BIT ADDRESS)

FIGURE 10-7:

I2C WAVEFORMS FOR TRANSMISSION (7-BIT ADDRESS)

Status bits as Data

Transfer is Received

SSPSR

→ SSPBUF

Generate ACK Pulse

Set bit SSPIF

(SSP Interrupt Occurs if Enabled)

SSPOV

Yes

Note 1:

Shaded cells show the conditions where the user software did not properly clear the overflow condition.

A7 A6 A5 A4 A3 A2 A1

SDA

SCL

Bus master

terminates

transfer

Bit SSPOV is set because the SSPBUF register is still full

Cleared in software

SSPBUF register is read

ACK

Receiving Data

ACK

R/W = 0

Receiving Address

SSPIF (PIR1<3>)

BF (SSPSTAT<0>)

SSPOV (SSPCON<6>)

ACK

ACK is not sent

SDA

SCL

SSPIF (PIR1<3>)

BF (SSPSTAT<0>)

CKP (SSPCON<4>)

ACK

Transmitting Data

R/W = 1

Receiving Address

789

123

Cleared in software

SSPBUF is written in software

From SSP Interrupt

Service Routine

Set bit after writing to SSPBUF

Data is

sampled

SCL held low

while CPU

responds to SSPIF

(the SSPBUF must be written to

before the CKP bit can be set)

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