H8SLASH3028F datasheet(629/923 Pages) RENESAS

629 / 923 page

Rev. 2.00, 09/03, page 599 of 890

18.6

Flash Memory Programming/Erasing

A software method, using the CPU, is employed to program and erase flash memory in the on-

board programming modes. There are four flash memory operating modes: program mode, erase

mode, program-verify mode, and erase-verify mode. Transitions to these modes for addresses

H'000000 to H'03FFFF are made by setting the PSU, ESU, P, E, PV, and EV bits in FLMCR1.

The flash memory cannot be read while being programmed or erased. Therefore, the program

(user program) that controls flash memory programming/erasing should be located and executed in

on-chip RAM or external memory.

See section 18.11, Flash Memory Programming and Erasing Precautions, for points to be noted

when programming or erasing the flash memory. In the following operation descriptions, wait

times after setting or clearing individual bits in FLMCR1 are given as parameters; for details of

the wait times, see section 21.2.6, Flash Memory Characteristics.

Notes: 1. Operation is not guaranteed if setting/resetting of the SWE, ESU, PSU, EV, PV, E, and

P bits in FLMCR1 is executed by a program in flash memory.

2. When programming or erasing, set FWE to 1 (programming/erasing will not be

executed if FWE = 0).

3. Programming must be executed in the erased state. Do not perform additional

programming on addresses that have already been programmed.

H8/3028F Datasheet(PDF) 629 Page - Renesas Technology Corp