3069RF-ZTAT Datasheet, PDF (600/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

18.2.2 Operating Mode
When each mode pin and the FWE pin are set in the reset state and reset start is performed, the
microcomputer enters each operating mode as shown in figure 18.2. For the setting of each mode
pin and the FWE pin, see table 18.1.
• Flash memory cannot be read, programmed, or erased in ROM invalid mode.
• 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
PROM mode.
ROM invalid
mode
4-5=0
ROM invalid
mode setting
4-5=0
User ^mode
setting
Reset state
4-5=0
PROM mode setting
PROM mode
4-5 _Boot
mode
=0
setting
User mode
FWE=0
User program
FWE=1
mode
RAM emulation is enabled
User boot
mode
On-board programming mode
Boot mode
Figure 18.2 Mode Transition of Flash Memory
Rev. 5.0, 09/04, page 578 of 978