SH7137 Datasheet, PDF (910/1160 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 22 Flash Memory
22.2.2 Operating Mode
When each mode pin and the FWE pin are set in the reset state and the reset signal is released, the
microcomputer enters each operating mode as shown in figure 22.2. For the setting of each mode
pin and the FWE pin, see table 22.1.
• 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
User program
FWE = 1
mode
RAM emulation is enabled
User boot
mode
On-board programming mode
Boot mode
Figure 22.2 Mode Transition of Flash Memory
Rev. 2.00 Sep. 10, 2008 Page 884 of 1130
REJ09B0402-0200