HD6432633 Datasheet, PDF (955/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

22.4.3 Flash Memory Operating Modes
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 22-3. 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.
*1
User mode
(on-chip ROM
enabled)
MD1 = 1,
MD2 = 1,
FWE = 0
RES = 0
MD1 = 1,
MD2 = 1,
FWE = 1
FWE = 1 FWE = 0
User
*1
program mode
Reset state
RES = 0
MD1 = 0,
MD2 = 0,
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 = 0, MD1 = 0, MD2 = 0, P14 = 0, P16 = 0, PF0 = 1
Figure 22-3 Flash Memory State Transitions
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