August 2008
Beginner to intermediate
304 pages
6h 2m
English
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3.8. PIC16 C EEPROM Interface
• EEPROM test system
• EEPROM test program
The internal electrically erasable programmable read only memory block is not strictly speaking a peripheral, as it is internal to the MCU, but it is accessed in a way similar to external devices so it is included in this part. In the 16F877, the EEPROM is a block of 256 bytes of nonvolatile read/write memory. It allows data to be retained while the power is off, which is useful in applications such as an electronic lock where a secure code needs to be stored.
Figure 3.11shows a test circuit that demonstrates its operation. Arbitrary 8-bit codes are set on the switch bank, which are stored, recalled, and displayed on the LED bank. The R/!W (Read/Not Write) input switch is ...
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