SH7211 Datasheet, PDF (912/1228 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family

Section 21 Flash Memory
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.
ROM invalid
mode
RES = 0
ROM invalid
mode setting
Reset state
RES = 0
Programmer
mode setting
Programmer
mode
R_U^E_s^S_er⁼_mo⁰_de setting
Boot
RES ₌
mode _setting
0
User mode
FWE = 0
FWE = 1
User program
mode
User boot
mode
Boot mode
On-board programming mode
Note: * Except for single chip mode.
Figure 21.2 Mode Transition of Flash Memory
Rev. 2.00 May. 08, 2008 Page 888 of 1200
REJ09B0344-0200