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HD64F2149YV Folha de dados(PDF) 720 Page - Renesas Technology Corp

Nome de Peças HD64F2149YV
Descrição Electrónicos  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
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Section 22 ROM
Rev. 3.00 Jan 18, 2006 page 692 of 1044
REJ09B0280-0300
22.4.3
Flash Memory Operating Modes
Mode Transitions: When the mode pins are set in the reset state and a reset-start is executed, the
MCU enters one of the operating modes shown in figure 22.3. 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 programming mode
User
program mode
User mode with
on-chip ROM
enabled
Reset state
Programmer
mode
RES = 0
SWE = 1
SWE = 0
*1
*2
Notes: Only make a transition between user mode and user program mode when the CPU is
not accessing the flash memory.
1. MD0 = MD1 = 0, P92 = P91 = P90 = 1
2. MD0 = MD1 = 0, P92 = 0, P91 = P90 = 1
RES = 0
RES = 0
RES = 0
MD1 = 1
Figure 22.3 Flash Memory Mode Transitions



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