HD64F2168 Datasheet, PDF (653/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

20.1.1 Operating Mode
When each mode pin and the FWE pin are set in the reset state and reset start is performed, this
LSI enters each operating mode as shown in figure 20.2.
• 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 boot mode, user
program mode, and user boot mode.
• Flash memory can be read, programmed, or erased by means of the PROM programmer in
programmer mode.
Reset state
RES = 0
Programmer mode setting
Programmer
mode
User mode
RES
User
=⁰
mode
setting
Boot
RES ₌
mode _setting
0
FLSHE = 0
→ FWE = 0
User program
FWE = 1 →
mode
User boot
mode
FLSHE = 1
On-board programming mode
Boot mode
Figure 20.2 Mode Transition of Flash Memory
Rev. 3.00, 03/04, page 613 of 830