Read Mode; P/E Modes; Mode Transitions; Transition From E2 Dataflash Access Disable Mode To Read Mode - Renesas RX100 Series User Manual

RX13T Group
31.7.1.2

Read Mode

Read mode is for high-speed reading of the ROM/E2 DataFlash. Reading from a ROM address for reading can be
accomplished in one ICLK clock.
(1) ROM/E2 DataFlash Read Mode
In this mode, both the ROM and E2 DataFlash are in read mode. The sequencer enters this mode from P/E mode when
setting the FPMCR register to 08h, setting the FENTRYR.FENTRYD bit to 0, and setting the FENTRYR.FENTRY0 bit
to 0.
31.7.1.3

P/E Modes

The P/E mode is for programming and erasure of the ROM/E2 DataFlash.
(1) ROM P/E Mode
In this mode, the ROM is in P/E mode, and the E2 DataFlash is in read mode. The sequencer enters this mode when
setting the FENTRYR.FENTRYD to 0, setting the FENTRYR.FENTRY0 bit to 1, and setting the FPMCR register 82h or
C2h.
(2) E2 DataFlash P/E Mode
In this mode, the ROM is in read mode, and the E2 DataFlash is in P/E mode. The sequencer enters this mode when the
setting the FENTRYR.FENTRYD to 1, setting the FENTRYR.FENTRY0 bit to 0, and setting the FPMCR register 10h or
50h.
31.7.2

Mode Transitions

31.7.2.1

Transition from E2 DataFlash Access Disable Mode to Read Mode

Reading of the E2 DataFlash requires switching from E2 DataFlash access disabled mode to ROM/E2 DataFlash read
mode.
Set the DFLCTL.DFLEN bit to 1 to switch to ROM/E2 DataFlash read mode.
Figure 31.6 shows the Procedure for Transition from E2 DataFlash Access Disabled Mode to ROM/E2 DataFlash Read
Mode.
Note 1. t
Figure 31.6 Procedure for Transition from E2 DataFlash Access Disabled Mode to ROM/E2 DataFlash Read
Mode
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
Start in ROM/E2 DataFlash
access disabled mode
DFLCTL.DFLEN bit = 1
1
Wait: t *
DSTOP
End in ROM/E2 DataFlash
read mode
: STOP recovery time (Refer to the Electrical Characteristics chapter.)
DSTOP
Enable access to the E2 DataFlash.
31. Flash Memory (FLASH)
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