R5F72115D160FPV datasheet(912/1228 Pages) RENESAS

912 / 1228 page

Section 21 Flash Memory

Rev. 2.00 May. 08, 2008 Page 888 of 1200

REJ09B0344-0200

21.2.2

Operating Mode

When each mode pin and the FWE pin are set in the reset state and the reset signal is released, the

microcontroller enters each operating mode as shown in figure 21.2. For the setting of each mode

pin and the FWE pin, see table 21.1.

• Flash memory cannot be read, programmed, or erased in ROM invalid mode. The

programming/erasing interface registers cannot be written to. When these registers are read,

H'00 is always read.

• Flash memory can be read in user mode, but cannot be programmed or erased.

• Flash memory can be read, programmed, or erased on the board only in user program mode,

user boot mode, and boot mode.

• Flash memory can be read, programmed, or erased by means of the PROM programmer in

programmer mode.

Programmer

mode

Reset state

ROM invalid

mode

User mode

User program

mode

User boot

mode

Boot mode

On-board programming mode

Note: * Except for single chip mode.

FWE = 0

FWE = 1

RES = 0

ROM invalid

mode setting

RES

= 0

User

ode

setting

Boot

mode

setting

RES

= 0

RES = 0

Programmer

mode setting

Figure 21.2 Mode Transition of Flash Memory

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