mc68hc05x4dw Freescale Semiconductor, Inc, mc68hc05x4dw Datasheet - Page 20

• Manufacturer Part Number: mc68hc05x4dw
• Description: Xc68hc705x4 Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Bootloader
functions
Modes of Operation and Pin Descriptions
MC68HC05X4 Rev 1.0
The bootloader code deals with the copying of user code from an
external EPROM into the on-chip EPROM. The bootloader function can
only be used with an external EPROM. The bootloader performs a
programming pass and then does a verify pass .
Pins PB3 and PB4 are used to select various bootloader functions,
including the programming mode (see
and PB6, are used to drive the PROG and VERF LED outputs. While the
EPROM is being programmed the PROG LED flashes and when
programming is complete the VERF LED flashes .
Freescale Semiconductor, Inc.
For More Information On This Product,
Modes of Operation and Pin Descriptions
Go to: www.freescale.com
Figure
4). Two other pins, PB1
8-modes