SH7052 Datasheet, PDF (715/919 Pages) Renesas Technology Corp – SuperHTM RISC engine

20.2.2 Mode Transitions
When the mode pins and the FWE pin are set in the reset state and a reset-start is executed, the
microcomputer enters an operating mode as shown in figure 20.2. In user mode, flash memory can
be read but not programmed or erased.
The boot, user program and programmer modes are provided as modes to write and erase the flash
memory.
MD1 = 1,
MD2 = 1,
FWE = 0
*1
RES = 0
User mode
MD1 = 1,
MD2 = 1,
FWE = 1
FWE = 1 FWE = 0
User
*1
program mode
Reset state
RES = 0
MD1 = 0,
MD2 = 1,
FWE = 1
RES = 0
*2
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.
1. RAM emulation possible
2. MD0 = 1, MD1 = 1, MD2 = 0
Figure 20.2 Flash Memory State Transitions
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