H8SXSLASH1663M datasheet(1193/1504 Pages) RENESAS

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Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1161 of 1468

REJ09B0412-0200

Memory MAT switching is enabled by setting FMATS. However note that access to a memory

MAT is not allowed until memory MAT switching is completed. During memory MAT switching,

the LSI is in an unstable state, e.g. if an interrupt occurs, from which memory MAT the interrupt

vector is read is undetermined. Perform memory MAT switching in accordance with the

description in section 25.11, Switching between User MAT and User Boot MAT.

Except for memory MAT switching, the erasing procedure is the same as that in user program

mode.

The area that can be executed in the steps of the procedure program (on-chip RAM, user MAT,

and external space) is shown in section 25.8.5, On-Chip Program and Storable Area for Program

Data.

25.8.5

On-Chip Program and Storable Area for Program Data

In the descriptions in this manual, the on-chip programs and program data storage areas are

assumed to be in the on-chip RAM. However, they can be executed from part of the flash memory

which is not to be programmed or erased as long as the following conditions are satisfied.

1. The on-chip program is downloaded to and executed in the on-chip RAM specified by

FTDAR. Therefore, this on-chip RAM area is not available for use.

2. Since the on-chip program uses a stack area, allocate 128 bytes at the maximum as a stack

area.

3. Download requested by setting the SCO bit in FCCS to 1 should be executed from the on-chip

RAM because it will require switching of the memory MATs.

4. In an operating mode in which the external address space is not accessible, such as single-chip

mode, the required procedure programs, NMI handling vector table, and NMI handling routine

should be transferred to the on-chip RAM before programming/erasure starts (download result

is determined).

5. The flash memory is not accessible during programming/erasure. Programming/erasure is

executed by the program downloaded to the on-chip RAM. Therefore, the procedure program

that initiates operation, the NMI handling vector table, and the NMI handling routine should be

stored in the on-chip RAM other than the flash memory.

6. After programming/erasure starts, access to the flash memory should be inhibited until FKEY

is cleared. The reset input state (period of

RES = 0) must be set to at least 100 µs when the

operating mode is changed and the reset start executed on completion of programming/erasure.

Transitions to the reset state are inhibited during programming/erasure. When the reset signal

is input, a reset input state (period of

RES = 0) of at least 100 µs is needed before the reset

signal is released.

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