ANSELA datasheet(150/222 Pages) MICROCHIP

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MCP19111

DS22331A-page 150

 2013 Microchip Technology Inc.

27.3.8

START/STOP CONDITION INTERRUPT

MASKING

The SCIE and PCIE bits of the SSPCON3 register can

enable the generation of an interrupt in Slave modes

that do not typically support this function. These bits

will have no effect on slave modes where interrupt on

Start and Stop detect are already enabled.

FIGURE 27-4:

I2C START AND STOP CONDITIONS

FIGURE 27-5:

I2C RESTART CONDITION

27.3.9

ACKNOWLEDGE SEQUENCE

The 9th SCL pulse for any transferred byte in I2C is

dedicated as an Acknowledge. It allows receiving

devices to respond back to the transmitter by pulling

the SDA line low. The transmitter must release control

of the line during this time to shift in the response. The

Acknowledge (ACK) is an active-low signal, pulling the

SDAx line low indicates to the transmitter that the

device has received the transmitted data and is ready

to receive more.

The result of an ACK is placed in the ACKSTAT bit of

the SSPCON2 register.

Slave software, when the AHEN and DHEN bits are

set, allow the user to set the ACK value sent back to

the transmitter. The ACKDT bit of the SSPCON2 regis-

ter is set/cleared to determine the response.

Slave hardware will generate an ACK response if the

AHEN and DHEN bits of the SSPCON3 register are

clear.

There are certain conditions where an ACK will not be

sent by the slave. If the BF bit of the SSPSTAT register

or the SSPOV bit of the SSPCON1 register are set

when a byte is received, an ACK will not be sent.

When the module is addressed, after the 8th falling

edge of SCL on the bus, the ACKTIM bit of the

SSPCON3 register is set. The ACKTIM bit indicates

the acknowledge time of the active bus. The ACKTIM

Status bit is only active when the AHEN bit or DHEN

bit is enabled.

SDA

SCL

Stop

Condition

Start

Condition

Change of

Data Allowed

Change of

Data Allowed

Restart

Condition

Change of

Data Allowed

Change of

Data Allowed

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