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MC908QT2ACDWE Datasheet(PDF) 29 Page - Freescale Semiconductor, Inc |
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MC908QT2ACDWE Datasheet(HTML) 29 Page - Freescale Semiconductor, Inc |
29 / 200 page FLASH Memory (FLASH) MC68HC908QYA/QTA Family Data Sheet, Rev. 3 Freescale Semiconductor 29 2.6 FLASH Memory (FLASH) The FLASH memory is intended primarily for program storage. In-circuit programming allows the operating program to be loaded into the FLASH memory after final assembly of the application product. It is possible to program the entire array through the single-wire monitor mode interface. Because no special voltages are needed for FLASH erase and programming operations, in-application programming is also possible through other software-controlled communication paths. This subsection describes the operation of the embedded FLASH memory. The FLASH memory can be read, programmed, and erased from the internal VDD supply. The program and erase operations are enabled through the use of an internal charge pump. The minimum size of FLASH memory that can be erased is 64 bytes; and the maximum size of FLASH memory that can be programmed in a program cycle is 32 bytes (a row). Program and erase operations are facilitated through control bits in the FLASH control register (FLCR). Details for these operations appear later in this section. NOTE An erased bit reads as a 1 and a programmed bit reads as a 0. A security feature prevents viewing of the FLASH contents.(1) 2.6.1 FLASH Control Register The FLASH control register (FLCR) controls FLASH program and erase operations. HVEN — High Voltage Enable Bit This read/write bit enables high voltage from the charge pump to the memory for either program or erase operation. It can only be set if either PGM =1 or ERASE =1 and the proper sequence for program or erase is followed. 1 = High voltage enabled to array and charge pump on 0 = High voltage disabled to array and charge pump off MASS — Mass Erase Control Bit This read/write bit configures the memory for mass erase operation. 1 = Mass erase operation selected 0 = Mass erase operation unselected 1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for unauthorized users. Bit 7 654321 Bit 0 Read: 0000 HVEN MASS ERASE PGM Write: Reset: 00000000 = Unimplemented Figure 2-3. FLASH Control Register (FLCR) |
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