SH7018 Datasheet, PDF (333/431 Pages) Renesas Technology Corp – SuperH™ RISC engine

16.2.2 Mode Transitions
When the mode pins and the FWP pin are set in the reset state and a reset-start is executed, the
SH7018 enters one of the operating modes shown in figure 16.2. 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 programmer
mode.
*1
User mode
MD1 = 1,
FWP = 1
RES = 0
Reset state
MD1 = 1,
FWP = 0
RES = 0
RES = 0
*2
FWP = 0 FWP = 1
User
*1
program mode
MD1 = 0, RES = 0
FWP = 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.
1. RAM emulation possible
2. MD0 = 1, MD1 = 0, MD2 = 1, MD3 = 1
Figure 16.2 Flash Memory Mode Transitions
317