PIC16LC774-04SLASHSS datasheet(71/200 Pages) MICROCHIP

71 / 200 page

PIC16C77X

Advance Information

DS30275A-page 71

8.2.5

MASTER MODE

Master mode of operation is supported by interrupt

generation on the detection of the START and STOP

conditions. The STOP (P) and START (S) bits are

cleared from a reset or when the MSSP module is dis-

abled. Control of the I2C bus may be taken when the P

bit is set, or the bus is idle with both the S and P bits

clear.

In master mode, the SCL and SDA lines are manipu-

lated by the MSSP hardware.

The following events will cause SSP Interrupt Flag bit,

SSPIF, to be set (SSP Interrupt if enabled):

• START condition

• STOP condition

• Data transfer byte transmitted/received

• Acknowledge transmit

• Repeated Start

FIGURE 8-17: SSP BLOCK DIAGRAM (I2C MASTER MODE)

Read

Write

SSPSR

Start bit, Stop bit,

Start bit detect,

SSPBUF

Internal

data bus

Set/Reset, S, P, WCOL (SSPSTAT)

shift

clock

MSb

LSb

SDA

Acknowledge

Generate

Stop bit detect

Write collision detect

Clock Arbitration

State counter for

end of XMIT/RCV

SCL

SCL in

Bus Collision

SDA in

SSPADD<6:0>

Baud

Set SSPIF, BCLIF

Reset AKSTAT, PEN (SSPCON2)

rate

generator

SSPM3:SSPM0,

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