6. ROM
Rev.3.00 Jul. 19, 2007 page 122 of 532
REJ09B0397-0300
6.2.3
Flash Memory Operating Modes
Mode Transition Diagram:
When the TEST
2
, TEST, and FWE pins are set in the reset state and
a reset start is effected, the chip enters one of the operating modes shown in figure 6.3. In user
mode, the flash memory can be read but cannot be programmed or erased.
Modes in which the flash memory can be programmed and erased are boot mode, user program
mode, and Writer mode.
Boot mode
On-board pro
g
rammin
g
mode
User
pro
g
ram
mode
User mode
Reset state
Writer mode
FWE = 1,
TEST2 = TEST = 0
RES
= 0
RES
= 0
TEST2 = 1,
FWE = 1,
SWE = 1
FWE = 0
or
SWE = 0
*
RES
= 0
TEST
= 0, TEST2 = 1,
FWE = 0
RES
= 0
Transitions between user mode and user pro
g
ram mode should only be
made when the CPU is not accessin
g
the flash memory.
Notes:
TEST2 = 0, TEST = 1
PB6 = PB5 = 1
PB4 = 0
*
Figure 6.3 Flash Memory Related State Transitions
Содержание F-ZTAT H8 Series
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