MCP19124 datasheet(172/236 Pages) MICROCHIP

172 / 236 page

MCP19124/5

DS20005619A-page 172

 2016 Microchip Technology Inc.

28.4.5

SLAVE MODE 10-BIT ADDRESS

RECEPTION

This section describes a standard sequence of events

for the MSSP module configured as an I2C Slave in

10-bit Addressing mode.

Figure 28-12 is used as a visual reference for this

description.

This is a step-by-step process of what must be done

by slave software to accomplish I2C communication:

Bus starts idle.

Master sends Start condition; S bit in the

SSPSTAT register is set; SSPIF is set if interrupt

on Start detect is enabled.

Master sends matching high address with R/W

bit clear; UA bit in the SSPSTAT register is set.

Slave sends ACK and SSPIF is set.

Software clears the SSPIF bit.

Software reads received address from SSPBUF,

clearing the BF flag.

Slave loads low address into SSPADD,

releasing SCL.

Master sends matching low-address byte to the

Slave; UA bit is set.

Slave sends ACK and SSPIF is set.

10. Slave clears SSPIF.

11. Slave reads the received matching address

from SSPBUF, clearing BF.

12. Slave loads high address into SSPADD.

13. Master clocks a data byte to the slave and

clocks out the slave’s ACK on the 9th SCL pulse;

SSPIF is set.

14. If SEN bit in the SSPCON2 register is set, CKP

is cleared by hardware and the clock is

stretched.

15. Slave clears SSPIF.

16. Slave reads the received byte from SSPBUF,

clearing BF.

17. If SEN is set, the slave sets CKP to release the

SCL.

18. Steps 13–17 are repeated for each received

byte.

19. Master sends Stop to end the transmission.

28.4.6

10-BIT ADDRESSING WITH

ADDRESS OR DATA HOLD

Reception using 10-bit addressing with AHEN or

DHEN set is the same as with 7-bit modes. The only

difference is the need to update the SSPADD register

using the UA bit. All functionality, specifically when the

CKP bit is cleared and the SCL line is held low, is the

same. Figure 28-13 can be used as a reference of a

slave in 10-bit addressing with AHEN set.

Figure 28-14 shows a standard waveform for a slave

transmitter in 10-bit Addressing mode.

Note: Updates to the SSPADD register are not

allowed until after the ACK sequence.

Note: If the low address does not match, SSPIF

and UA are still set so that the slave

software can set SSPADD back to the high

address. BF is not set because there is no

match. CKP is unaffected.

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