MMC2107 - Freescale Semiconductor

Non-Volatile Memory FLASH (CMFR)
Freescale Semiconductor, Inc.
9.8.5 Erasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .214
9.8.5.1 Erase Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .215
9.8.5.2 Erase Margin Reads . . . . . . . . . . . . . . . . . . . . . . . . . . .218
9.8.5.3 Erasing Shadow Information Words. . . . . . . . . . . . . . . .219
9.8.6 Erase Pulse Amplitude and Width Modulation . . . . . . . . . .219
9.8.7 Emulation Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
9.9 Master Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
9.10 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220
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Freescale Semiconductor, I
9.2 Introduction
This section describes the operation of the embedded FLASH memory.
The FLASH memory can be read, programmed, and erased from a
single external programming voltage supply, V PP . The program and
erase operations are enabled through the use of an internal charge
pump.
The CDR MoneT FLASH uses the Motorola one-transistor bitcell
(MoneT). The 128-Kbyte CMFR array is divided into 16-Kbyte
(16,384 bytes) array blocks. The CMFR array size is created by using
eight array blocks.
The primary function of the CMFR is to serve as electrically
programmable and erasable NVM to store program instructions and/or
data. It is a class of nonvolatile solid state silicon memory device
consisting of an array of isolated elements, a means for selectively
adding and removing charge to the elements electrically and a means of
selectively sensing the stored charge in the elements. When power is
removed from the device, the stored charge of the isolated elements are
retained.
The CMFR is arranged into two major sections as shown in Figure 9-1.
The first section is the MoneT array used to store system program and
data. The second section is the bus interface unit (BIU) that controls
access and operation of the CMFR array.
Technical Data MMC2107 – Rev. 2.0
180 Non-Volatile Memory FLASH (CMFR) MOTOROLA
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