PIC16C717-I/SS 데이터 시트보기 (PDF) - Microchip Technology

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PIC16C717-I/SS

18/20-Pin, 8-Bit CMOS Microcontrollers with 10/12-Bit A/D

Microchip Technology 

PIC16C717/770/771

FIGURE 9-22: MASTER TRANSMIT FLOWCHART

Idle Mode

Write SSPBUF

Num_Clocks = 0,

BF = 1

Force SCL = 0

Yes

Num_Clocks

= 8?

No

Load BRG with

SSPADD<6:0>,

start BRG count,

SDA = Current Data bit

BRG No

rollover?

Yes

Stop BRG,

Force SCL = 1

Release SDA so

slave can drive ACK,

Force BF = 0

Load BRG with

SSPADD<6:0>,

start BRG count

BRG No

rollover?

Yes

Force SCL = 1,

Stop BRG

(Clock Arbitration)

No

SCL = 1?

Yes

SDA = No

Data bit?

Yes

Load BRG with

SSPADD<6:0>,

count SCL high time

Bus collision detected

Set BCLIF, hold prescale off,

Clear XMIT enable

BRG

rollover?

No

No

SCL = 0?

Yes

SDA = No

Data bit?

Yes

Num_Clocks

= Num_Clocks + 1

Yes

Reset BRG

(Clock Arbitration)

No

SCL = 1?

Yes

Read SDA and place into

ACKSTAT bit (SSPCON2<6>)

Load BRG with

SSPADD<6:0>,

count high time

No

Rollover?

Yes

Force SCL = 0,

Set SSPIF

© 1999 Microchip Technology Inc.

Advanced Information

DS41120A-page 93

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