R5F72115D160FPV datasheet(910/1228 Pages) RENESAS

910 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 886 of 1200

REJ09B0344-0200

⎯ User branching

Programming is performed in 256-byte units. Each round of programming consists of

application of the programming pulse, reading for verification, and several other steps. Erasing

is performed in block units and each round of erasing consists of several steps. A user-

processing routine can be executed between each round of erasing, and making the setting for

this is called the addition of a user branch.

• Protection modes

There are two modes of protection: software protection is applied by register settings and

hardware protection is applied by the level on the FWE pin. Protection of the flash memory

from programming or erasure can be selected.

When an abnormal state is detected, such as runaway execution of programming/erasing, the

protection modes initiate the transition to the error protection state and suspend

programming/erasing processing.

• Programming/erasing time

The time taken to program 256 bytes of flash memory in a single round is 2 ms (typ.), which is

equivalent to 7.8

μs per byte. The erasing time is 80 ms (typ.) per 8-Kbyte block, 600 ms (typ.)

per 64-Kbyte block, and 1200 ms (typ.) per 128-Kbyte block.

• Number of programming operations

The flash memory can be programmed up to 100 times.

• Operating frequency for programming/erasing

The operating frequency range for programming/erasing I

φ = 32 to 40 MHz

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