SH74593_15 Datasheet, PDF (6/38 Pages) Renesas Technology Corp – RENESAS MCU

SH74593
Page
12-20
Description
• Figure 12.6 FCU Mode Transition Diagram (ROM-Related Modes)
Product Transition from “ROM read mode” to “ROM P/E mode”
SH74562 FENTRYR = H’0001
SH74593 FENTRYR = H’0001 or FENTRYR = H’0002
2. Details
12-20
12-20
Please refer to Appendix D.5.
• 12.6.2 Conditions for FCU Command Acceptance : (1) ROM read mode
Product Description
SH74562 This MCU switches to this mode when the FENTRY0 bit in the FENTRYR register is set to "0".
SH74593 This MCU switches to this mode when both the FENTRY1 and FENTRY0 bits in the FENTRYR
register are set to "0".
• 12.6.2 Conditions for FCU Command Acceptance : (2) ROM P/E mode
Product Description
SH74562 The FCU enters this mode when the FENTRY0 bit is set to "1". Table 12.6 lists the commands that
the FCU accepts. The high-speed ROM readout operation cannot be used in this mode. Although
read access to locations H'FD80 0000 to H'FD8F FFFF is illegal, undefined values will be
returned. To read the ROM data, the FCU must switch to ROM read mode. If a peripheral-bus
read access to a location from H'FD80 0000 to H'FD8F FFFF is issued in the state where the
FENTRY0 bit is "1", a ROM access error will occur and the FCU will switch to the command-
locked state. (See section 12.8.3, Error Protection.)
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SH74593 The FCU enters this mode when either the FENTRY1 or FENTRY0 bit is set to "1". Table 12.6
lists the commands that the FCU accepts. The high-speed ROM readout operation cannot be used
in this mode. Although read access to locations H'FD80 0000 to H'FD97 FFFF is illegal, undefined
values will be returned. To read the ROM data, the FCU must switch to ROM read mode. If a
peripheral-bus read access to a location from H'FD90 0000 to H'FD97 FFFF is issued in the
state where the FENTRY1 bit is "1", or If a peripheral-bus read access to a location from
H'FD80 0000 to H'FD8F FFFF is issued in the state where the FENTRY0 bit is "1", a ROM access
error will occur and the FCU will switch to the command-locked state. (See section 12.8.3, Error
Protection.)
• Figure 12.7 Command State Transitions in ROM Read Mode and P/E mode
Product Transition from “ROM read mode” to “ROM P/E mode”
SH74562 FENTRYR = H’0001
SH74593 FENTRYR = H’0001 or FENTRYR = H’0002
12-23
Please refer to Appendix D.6.
• 12.6.3 FCU Command Usage : (1) Methods for switching to ROM P/E mode
Product Description
SH74562 For an application to execute ROM related FCU commands, it is necessary to set the FCU to ROM
P/E mode by setting the FENTRY0 bit in the FENTRYR register. (See section 12.6.2, Conditions for
FCU Command Acceptance.) To use ROM related FCU commands, set the FENTRY0 bit to "1".
See section 12.3.6, Flash P/E Mode Entry Register (FENTRYR) for the conditions for setting the
FENTRY0 bit.
SH74593 For an application to execute ROM related FCU commands, it is necessary to set the FCU to ROM
P/E mode by setting bits FENTRY1 and FENTRY0 in the FENTRYR register. (See section 12.6.2,
Conditions for FCU Command Acceptance.) To use FCU commands for the first 1-Mbyte and
second 0.5-Mbyte sections of ROM, set bits FENTRY1 and FENTRY0 to the corresponding
state. See section 12.3.6, Flash P/E Mode Entry Register (FENTRYR) for the conditions for setting
bits FENTRY1 and FENTRY0.
R01DS0186EJ0120 Rev.01.20
Sep 10, 2012
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