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Rev. 2.0, 11/00, page 174 of 1037
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.
Boot mode
On-board program mode
User
program
mode
User mode
Reset state
Programmer
mode
FWE = 1, MD0 = 0,
P12 = P13 = P14 = 1
RES = 0
RES = 0
FWE = 1
SWE = 1
FWE = 0
or
SWE = 0
RES = 0
MD0 = 1, FWE = 0
RES = 0
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
Note:
*
1
Figure 8.3 Flash Memory Mode Transitions
Summary of Contents for Hitachi H8S/2191
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