AN2635

www.DataSheet4U.com Freescale Semiconductor Application Note AN2635 Rev. 4, 10/2005 On-Chip FLASH Programming Routines For MC68HC908LB8, MC68HC908QL4, MC68HC908QB8, MC68HC908QB4, MC68HC908QY8, and MC68HC908QY4A Series1 By: Kazue Kikuchi MCU Applications Engineering Austin, Texas Introduction This application note applies to the MC68HC908LB8, MC68HC908QL4, MC68HC908QB4/QB8/QY8, and MC68HC908QY4A Series1 FLASH-based microcontroller units (MCUs). To program, erase, and verify FLASH, these MCUs have on-chip FLASH support routines residing in ROM (read-only memory). These routines may be accessed in either user mode or monitor mode and eliminate the need to develop separate FLASH routines for applications. This application note describes how to call each of the routines in user software, what is performed, and what is returned as confirmation of routine execution. The software files are available as a zip file, AN2635SW, from the Freescale Semiconductor website: www.freescale.com NOTE With the exception of mask set errata documents, if any other Freescale Semiconductor document contains information that conflicts with the information in the device data sheet, the data sheet should be considered to have the most current and correct data. 1. MC68HC908QY4A Series includes MC68HC908QY4A, MC68HC908QY2A, MC68HC908QY1A, MC68HC908QT4A, MC68HC908QT2A, MC68HC908QT1A © Freescale Semiconductor, Inc., 2005. All rights reserved. Routines Supported in ROM FLASH Overview The FLASH cell us...