Flash Memory Operating Modes - Renesas Hitachi H8S/2194 Series Hardware Manual

8.2.3

Flash Memory Operating Modes

(1) Mode Transitions
When each mode pin 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 8.3. 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.
User mode
FWE = 0
or
FWE = 1
SWE = 0
SWE = 1
User
program
mode
On-board program mode
Rev. 2.0, 11/00, page 174 of 1037
Reset state
Boot mode
Figure 8.3 Flash Memory Mode Transitions
RES = 0
*1
Programmer
mode
Note:
Only make a transition between user mode
and user program mode when the CPU is not
accessing the flash memory.
*1: MD0 = 0, P12 = P13 = 1, P14 = 0