HD6432345 Datasheet, PDF (565/907 Pages) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual

17.6.3 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 MCU enters one of the operating modes shown in figure 17.8. 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 writer mode.
FWE = 0,
MD₂ = MD₁ = 1
Reset state
User mode with
on-chip ROM
enabled
RES = 0
FWE = 1,
SWE = 1
FWE = 0
or SWE = 0
RES = 0
RES = 0
*1
*2
RES = 0
Writer mode
User
program 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. NMI = 1, MD₂ = MD₁ = MD₀ = 0, PF₂ = 1, PF₁ = PF₀ = 0
2. NMI = 1, FWE = 1, MD₂ = 0, MD₁ = 1
Figure 17.8 Flash Memory Mode Transitions
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