Mode Transition; Figure 20.2 Mode Transition Of Flash Memory - Renesas H8S/2437 Hardware Manual

20.1.1

Mode Transition

When each mode pin and the FWE pin are set in the reset state and the reset is canceled, 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.
User mode
Reset state
FLSHE = 0
→ FWE = 0
User program
mode
FWE = 1 →
FLSHE = 1

Figure 20.2 Mode Transition of Flash Memory

= 0
Programmer mode setting
User boot
mode
On-board programming mode
Rev. 1.00, 09/03, page 527 of 704
Programmer
mode
Boot mode