In addition to supporting the flash that resides in many different microcontrollers, PEmicro supports flash connected to an MCU via the SPI, I2C, and Address/Data bus interfaces. Depending on how the flash device is connected to the MCU, the programming algorithm may need to be set up to properly configure the external address, data, and bus control pins of the MCU.
In the case of flash memories connected to the address/data bus of an MCU, it can be difficult to understand when the chip select and/or other control pins are configured properly. Most often the issue is that the external flash memory Chip Enable (~CE), Output Enable (~OE), or Write Enable (WE) signals are not being driven properly. This blog post describes a way to look at these three signals to determine if they are being driven properly.
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