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PICkit? Serial Analyzer User’s Guide
? AUX2 Direction – AUX2 communication line – direction: 1 : input, 0 : output
4.6
COMMUNICATIONS: BASIC OPERATIONS
The I 2 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 2 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 2 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_)
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.
Write performs a write operation to the target device (refer to The I 2 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.
DS51647A-page 30
? 2007 Microchip Technology Inc.
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