PIC18LF4520-I/PT【PDF 20/151 页】IC MCU FLASH 16KX16 44TQFP

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PIC16(L)F1782/3

DS41579C-page 288

Preliminary

2011-2012 Microchip Technology Inc.

26.5.3.3

7-bit Transmission with Address

Hold Enabled

Setting the AHEN bit of the SSPCON3 register

enables additional clock stretching and interrupt gen-

eration after the 8th falling edge of a received match-

ing address. Once a matching address has been

clocked in, CKP is cleared and the SSPIF interrupt is

set.

Figure 26-18 displays a standard waveform of a 7-bit

Address Slave Transmission with AHEN enabled.

Bus starts Idle.

Master sends Start condition; the S bit of SSP-

STAT is set; SSPIF is set if interrupt on Start

detect is enabled.

Master sends matching address with R/W bit

set. After the 8th falling edge of the SCL line the

CKP bit is cleared and SSPIF interrupt is gener-

ated.

Slave software clears SSPIF.

Slave software reads ACKTIM bit of SSPCON3

ister to determine the source of the interrupt.

Slave reads the address value from the

SSPBUF register clearing the BF bit.

Slave software decides from this information if it

wishes to ACK or not ACK and sets the ACKDT

bit of the SSPCON2 register accordingly.

Slave sets the CKP bit releasing SCL.

Master clocks in the ACK value from the slave.

10. Slave hardware automatically clears the CKP bit

and sets SSPIF after the ACK if the R/W bit is

set.

11. Slave software clears SSPIF.

12. Slave loads value to transmit to the master into

SSPBUF setting the BF bit.

13. Slave sets the CKP bit releasing the clock.

14. Master clocks out the data from the slave and

sends an ACK value on the 9th SCL pulse.

15. Slave hardware copies the ACK value into the

ACKSTAT bit of the SSPCON2 register.

16. Steps 10-15 are repeated for each byte transmit-

ted to the master from the slave.

17. If the master sends a not ACK the slave

releases the bus allowing the master to send a

Stop and end the communication.

Note:

SSPBUF cannot be loaded until after the

ACK.

Note:

Master must send a not ACK on the last

byte to ensure that the slave releases the

SCL line to receive a Stop.

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