H8SXSLASH1663 datasheet(929/1158 Pages) RENESAS

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Section 21 Flash Memory (0.18-

µm F-ZTAT Version)

Rev.1.00 Jun. 07, 2006 Page 877 of 1102

REJ09B0294-0100

21.2

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

mode, and programmer mode are shown in table 21.1.

Reset state

Programmer

mode

User mode

User program

mode

USB boot mode

On-board programming mode

RES

= 0

User

mode

sett

ing

USB

boot

e sett

ing

RES

= 0

RES = 0

Programmer mode setting

SCI boot mode

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. Programming and erasure is completed.

Figure 21.2 Mode Transition of Flash Memory

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