The PIC17CXXX devices have the capability to inter-face external FLASH memory into the 64K x 16 pro-gram memory space. Coupled with this feature is the ability to read and write to the entire program memory of the device. Using one of the standard serial inter-faces on the PICmicro (USART, SPI, I 2 C™), a com-plete hex file can be downloaded into the external FLASH memory by a bootloader program. The PIC17CXXX family consists of seven devices as shownM Downloading HEX Files to External FLASH Memory TB024 Using PIC17CXXX PICmicro Microcontrollers Author: Rodger Richey Microchip Technology Inc. INTRODUCTION The PIC17CXXX devices have the capability to inter- face external FLASH memory into the 64K x 16 pro- gram memory space. Coupled with this feature is the ability to read and write to the entire program memory of the device. Using one of the standard serial inter- faces on the PICmicro (USART, SPI, I2C), a com- plete hex le can be downloaded into the external FLASH memory by a bootloader program. The PIC17CXXX family consists of seven devices as shown in Table 1 TABLE 1 ……