H8SXSLASH1663R datasheet(1140/1504 Pages) RENESAS

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Section 25 Flash Memory

Rev. 2.00 Sep. 24, 2008 Page 1108 of 1468

REJ09B0412-0200

25.2

Mode Transition Diagram

When the mode pins are set in the reset state and reset start is performed, this LSI enters each

operating mode as shown in figure 25.2. Although the flash memory can be read in user mode, it

cannot be programmed or erased. The flash memory can be programmed or erased in boot mode,

user program mode, user boot mode, and programmer mode. The differences between boot mode,

user program mode, user boot mode, and programmer mode are shown in table 25.1.

Reset state

Programmer

mode

User mode

User program

mode

User boot

mode

SCI boot mode

On-board programming mode

RES

= 0

User

mode

sett

ing

SCI

boot

mode

setting

RES

= 0

RES = 0

Programmer mode setting

RAM emulation can be

available

ROM disabled mode

RES = 0

ROM disabled mode

setting

Notes: * In this LSI, the user program mode is defined as the period from the timing when a program

concerning programming and erasure is started in user mode to the timing when the program is

completed.

1. Programming and erasure is started.

2. Programing and erasure is completed.

RES

= 0

USB

boot

mode

sett

ing

USB boot mode

Figure 25.2 Mode Transition of Flash Memory

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