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Getting Started
For example, to read seconds from the real-time clock:
Step 1 – Enter 0xA2 into the Slave Address[W] block in the Read section of the Basic
Operations window (top half of window)
Step 2 – Enter 0x02 into the Word Address block
Step 3 – Note that the Slave Address[R] has already been entered for you (the Read
bit is set).
Step 4 – Enter 0x01 into the Byte Count block
Step 5 – Click on the Execute button
The I 2 C combination command (Write then Read) will be sent to the 28-Pin Demo
Board. The command and the contents of Word Address 0x02 (seconds) will be
displayed in the transaction window as shown in Figure 2-7.
FIGURE 2-7:
RTC TRANSACTIONS DEMO
2.8.2
EEPROM
The Slave address for the emulated Serial EEPROM on the 28-Pin Demo Board is
hexadecimal A8 (0xA8). The Word Address selects one of 256 8-bit memory locations:
TABLE 2-2:
WORD ADDRESS CONTENTS
0x00
…
0xFF
Word Address
Memory Contents
…
Memory Contents
Contents
2.8.3
ADC
The Slave address for the ADC on the 28-Pin Demo Board is hexadecimal AA (0xAA).
The Word Address 0x01 selects the memory location containing the Most Significant 8
bits of the 10-bit ADC of the PIC microcontroller.
2.9
28-PIN DEMO I 2 C? SOURCE CODE AND FIRMWARE
The demo program source code and *.hex file can be found on the PICkit Serial
CD-ROM at D:\28-pin Demo Board\Firmware\ .
? 2007 Microchip Technology Inc.
DS51647A-page 15
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