User manual

PICkit™ Serial Analyzer User’s Guide

• AUX2 Direction – AUX2 communication line – direction: 1: input, 0: output

4.6 COMMUNICATIONS: BASIC OPERATIONS

The I

C Basic Operations window can be opened by selecting:

• Communications: Basic Operations

from the tool bar, or

• Communications > Basic Operations

from the menu bar

The I

C Basic Operations window is shown in Figures 4-3. There are two basic

communications commands, Read and Write.

Read performs a combination Write then Read commands to the target device (refer to

the I

C Specification reference in Section 4.1 “Introduction” above). The basic

structure of the command is:

• Start bit (S_)

• Slave Address[W] – Enter the slave address of the device to communicate with.

The write bit should be cleared to indicate a write operation

• Word Address – Enter the word address

• Restart (RS),

• Slave Address[R] – The slave address with the write bit set will be automatically

entered when the Slave Address[W] has been entered

• Byte Count – Enter the number of bytes to be read

• Stop bit (P_)

Write performs a write operation to the target device (refer to The I

C Specification

reference in Section 4.1 “Introduction” above). The basic structure of the command

is:

• Start bit (S_)

• Slave Address[W] – Enter the slave address of the device to communicate with.

The write bit should be cleared to indicate a write operation.

• Word Address – Enter the word address

• Data – Enter up to eight bytes of data

• Stop bit (P_)

The command will be logged in the Transactions window. A listing of the command

abbreviations is given in Table 4-2.

Note: The “x” indicates the value is a hexadecimal number. Clicking on “x” will

toggle it to a “d” indicating that the value is a decimal number.