MCP19124 datasheet(184/236 Pages) MICROCHIP

184 / 236 page

FIGURE 28-21:

I2C MASTER MODE WAVEFORM (RECEPTION, 7-BIT ADDRESS)

A7 A6 A5 A4 A3 A2 A1

SDA

SCL

12 3 4 56

7 8 9

1 2 3 4 5 6

7 8

12 3 4

ACK

Receiving Data from Slave

ACK

R/W

SSPIF

ACK is not sent

Write to SSPCON2<0>

(SEN = 1),

ACK from Slave

Data shifted in on falling edge of CLK

Cleared by software

SEN = 0

SSPOV

(SSPSTAT0)

ACK

Cleared by software

ACKEN

begin Start condition

Cleared by software

RCEN

Write to SSPBUF

occurs here, start XMIT

Master configured as a receiver

by programming SSPCON2<3> (RCEN = 1)

RCEN cleared

automatically

Write to SSPCON2<4> to start Acknowledge

sequence SDA = ACKDT (SSPCON2<5>) = 0

ACK from Master

SDA = ACKDT = 0

RCEN = 1, start

next receive

Set ACKEN, start Acknowledge sequence

SDA = ACKDT = 1

RCEN cleared

automatically

PEN bit = 1 written here

Bus master

terminates

transfer

SDA = 0, SCLx = 1

while CPU

responds to SSPxIR

Set SSPIF interrupt

at end of receive

Set SSPIF interrupt

at end of Acknowledge

sequence

Set SSPIF

at end of receive

Cleared by

software

Set SSPIF interrupt

at end of

Acknowledge

sequence

Set P bit

(SSPSTAT4)

and SSPIF

Last bit is shifted into SSPSR and

contents are unloaded into SSPBUF

SSPOV is set because

SSPBUF is still full

Master configured as a receiver

by programming SSPCON2<3> (RCEN = 1)

RCEN cleared

automatically

ACK from Master

SDA = ACKDT = 0

RCEN cleared

automatically

MCP19124 Datasheet(PDF) 184 Page - Microchip Technology

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