HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 565

• Manufacturer Part Number: HD6412340
• Description: H8S/2345 F-ZTAT Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

17.6.3
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.
Notes: Only make a transition between user mode and user program mode when the CPU is
FWE = 1,
SWE = 1
User mode with
on-chip ROM
enabled
Flash Memory Operating Modes
not accessing the flash memory.
1. NMI = 1, MD
2. NMI = 1, FWE = 1, MD
On-board programming mode
program mode
FWE = 0
or SWE = 0
User
FWE = 0,
MD
Figure 17.8 Flash Memory Mode Transitions
2
2
= MD
= MD
1
1
RES = 0
= 1
= MD
2
= 0, MD
RES = 0
0
= 0, PF
1
= 1
2
Reset state
= 1, PF
Boot mode
*
2
1
RES = 0
= PF
0
= 0
*
1
RES = 0
Writer mode
553