19.15.3 Flash Memory Operating Modes - Renesas H8S Series Hardware Manual

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)
SWE = 1
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
MD1 = 1,
MD2 = 1
RES = 0
RES = 0
SWE = 0
User
program mode
On-board programming mode
Figure 19-37 Flash Memory Mode Transitions
Reset state
MD1 = 1, *
MD2 = 0
RES = 0
Boot mode
RES = 0
Programmer mode
Rev.6.00 Oct.28.2004 page 621 of 1016
REJ09B0138-0600H