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| 型號： | PICDEM2 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | simple board |
| 中文描述： | 簡潔的主板 |
| 文件頁數(shù)： | 30/60頁 |
| 文件大?。?/td> | 1037K |
| 代理商： | PICDEM2 |
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2001 Microchip Technology Inc.
DS30374D-page 25
I
2
C/EEPROM Demo
5.2 MSSP Module
This section presents flowcharts to implement communication with Serial
EEPROM using the MSSP module in master mode. For SSP operation, refer
to Section 5.1.
5.2.1
Main Routine
The main routine is actually preceded by several register file, bit and vector
assignments (Figure 5.2). The program begins by configuring PORTB as
outputs and PORTC as inputs. The output data value will be read from
PORTB, so it is initialized to one.
The next part of the code initializes the MSSP module for master I
2
C mode.
The slew rate control is disabled and the clock rate is set to 100 kHz. Both the
RC3 and RC4 pins are made inputs as the MSSP module will control the data
direction.
Interrupts are not used in this program, so they are disabled. Also, the MSSP
is configured to enable I
2
C master mode.
The write/read loop begins with the initialization of the EEPROM address to
00h, and the device address to A0h. Then the write loop executes by writing
the output data value to each address in the EEPROM (Figure 5.3). After the
write loop, the EEPROM address and device address are re-initialized for
read. The read loop executes by reading data values for each EEPROM
address and verifying their accuracy (Figure 5.4).
After the read loop, the output data value is incremented by one and this
value displayed, via PORTB, on the LEDs. Then the write/read loop begins
again.
If an error is encountered when writing or reading the EEPROM, or if an
EEPROM value read is incorrect, the program jumps to the error loop, which
flashes the LEDs (Figure 5.5).
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