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The boot, user program and PROM modes are provided as modes to write and erase the flash
memory.
User mode
FWE = 1
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. The H8/3052F is placed in PROM mode by means of a dedicated PROM writer.
3. Mode settings are shown in the following table.
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Mode 6
Mode 7
Boot mode 5
Boot mode 6
Boot mode 7
Setting prohibited
User program mode 5
User program mode 6
User program mode 7
* 1, * 3
RES = 0
* 3
FWE = 0
* 1
User
program mode
On-board programming mode
Mode
FWE
MD
0
1
Figure 18.2 Flash Memory State Transitions
Reset state
* 2
RES = 0
* 3
RES = 0
Boot mode
Pins
MD
MD
2
1
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Rev. 3.00 Mar 21, 2006 page 557 of 814
Section 18 ROM
RES = 0
PROM mode
REJ09B0302-0300
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