R01UH0823EJ0100 Rev.1.00 Page 1687 of 1823
Jul 31, 2019
RX23W Group 50. Flash Memory (FLASH)
50.7.2.3 Transition from P/E Mode to Read Mode
High-speed reading of the ROM requires switching to ROM/E2 DataFlash read mode.
Figure 50.10 shows the Procedure for Transition from ROM P/E Mode to ROM/E2 DataFlash Read Mode. Figure
50.11
shows the Procedure for Transition from E2 DataFlash P/E Mode to ROM/E2 DataFlash Read Mode.
Figure 50.10 Procedure for Transition from ROM P/E Mode to ROM/E2 DataFlash Read Mode
Start in ROM P/E mode
FENTRYR register = AA00h
FPR register = A5h
FPMCR register = 92h
FPMCR register = 6Dh
FPMCR register = 92h
FPR register = A5h
FPMCR register = 08h
FPMCR register = F7h
FPMCR register = 08h
FPR register = A5h
FPMCR register = 12h
FPMCR register = EDh
FPMCR register = 12h
Note 1. t
DIS
: ROM mode transition wait time 1 (Refer to the Electrical Characteristics chapter.)
t
MS
: ROM mode transition wait time 2 (Refer to the Electrical Characteristics chapter.)
FENTRYR register = 0000h?
Yes
No
Wait for t
DIS
*1
Wait for t
MS
*1
Set 92h in
the FPMCR register
Set 12h in
the FPMCR register
Set 08h in
the FPMCR register
End in ROM/E2 DataFlash
read mode
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