HD64F2357F20V Datasheet, PDF (651/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

19.15.3 Flash Memory Operating Modes
Mode Transitions: When the mode pins are set in the reset state and a reset-start is executed, the chip enters one of the
operating modes shown in figure 19-37. In user mode, flash memory can be read but not programmed or erased.
Flash memory can be programmed and erased in boot mode, user program mode, and PROM mode.
User mode
(on-chip ROM
enabled)
MD1 = 1,
MD2 = 1
RES = 0
RES = 0
SWE = 1 SWE = 0
User
program mode
Reset state
MD1 = 1,
MD2 = 0
*
RES = 0
RES = 0
Programmer mode
On-board programming mode
Boot mode
Notes: Only make a transition between user mode and user program mode when the CPU is
not accessing the flash memory.
* MD0 = 0, MD1 = 0, MD2 = 0, P66 = 1, P65 = 0, P64 = 0
Figure 19-37 Flash Memory Mode Transitions
Rev.6.00 Oct.28.2004 page 621 of 1016
REJ09B0138-0600H