The Microchip PIC32MX110F016B.

I went to Microchip’s website and worked through their parametric search tools.  I was looking for a device that could use the SPI interface at at least 10 Mbps and at the lowest cost.  There were no 8 bit parts that could meet the SPI requirement.  There were some 16 bit parts that could meet this requirement, but they were the high end parts.  I had to look into the datasheets to see the maximum SPI baud rate.  Since JTAG does not have 8 bit fixed width registers, I will probably have to play some tricks to use the standard SPI for JTAG operation.

Microchip PIC32MX110F016B

Device advantages

• Two Fast SPI channels (1 for programming, 1 for data storage)
• DMA transfers for each SPI channel– Frees software up to do data manipulation tasks
• 5 V tolerant pins
• I am familiar with Microchip and their IDE — MPLAB X
• US $1.73 each in quantities of 100
• Compatible upgrade path if this chip isn’t enough
• Low pin count — 28 pins
• Dip Part for prototyping

Device Disadvantages

• I am unfamiliar with microchip 32 bit architecture
• Limitations on free C compiler — mostly in optimization