MCP960X datasheet(24/57 Pages) MICROCHIP

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DS20005426G-page 24

MCP960X/L0X/RL0X

FIGURE 4-5:

Timing Diagram to Set a Register Pointer, Write Two Bytes, and Read the Data.

SDA

Alert 1 MSB

678

456

SCL

Address Byte

x xx x

TABLE 4-4:

POINTERS

Alert Limit

Registers

Pointer

Alert 1

0001 0000

Alert 2

0001 0001

Alert 3

0001 0010

Alert 4

0001 0011

Alert 1 LSB

Note: this is an example pseudo routine:

i2c_start();

// send START command

i2c_write(b’1100 0000’);

//WRITE Command

//also, make sure bit 0 is cleared ‘0’

i2c_write(b’0001 00XX’);

// Write Alert registers

i2c_write(b’XXXX XXXX’);

// Write register Upper Byte

i2c_write(b’XXXX XXXX’);

// Write register Lower Byte

i2c_stop();

// send STOP command

i2c_start();

// send START command

i2c_write(b’1100 0001’);

//READ Command

//also, make sure bit 0 is set ‘1’

UpperByte = i2c_read(ACK);

// READ 8 bits (with t

STRETCH delay)

//and Send ACK bit

LowerByte = i2c_read(NAK);

// READ 8 bits (with t

STRETCH delay)

//and Send NAK bit

i2c_stop();

// send STOP command

Alert Limit 1

(Table 4-4)

Device*

1100

Alert 1 MSB

123

345

Address Byte

Alert 1 LSB

Host

SDA

SCL

xxx

MCP960X/L0X/RL0X Clock Stretching,

tSTRETCH

Device*

Host

*MCP960X/L0X/RL0X

Device*

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