Renesas R8C/20 User Manual

R8C/20 Group, R8C/21 Group 19. Flash Memory
Rev.2.00 Aug 27, 2008 Page 388 of 458
REJ09B0250-0200
Figure 19.7 FMR4 Register
Flash Memory Control Register 4
Symbol Address After Reset
FMR4
01B3h 01000000b
Bit Symbol Bit Name Function RW
NOTES:
1.
2.
3.
4.
5.
When setting this bit to 1, set to 1 immediately after setting it first to 0. Do not generate an interrupt betw een setting
the bit to 0 and setting it to 1.
This bit is enabled w hen the FMR40 bit is set to 1 (enable) and this bit can be w ritten during the period betw een
issuing an erase command and completing an erase (This bit is set to 0 during the periods other than above.)
In EW0 mode, this can be set to 0 or 1 by a program.
In EW1 mode, this bit is automatically set to 1 if a maskable interrupt is generated during an erase operation w hile the
FMR40 bit is set to 1. Do not set this bit to 1 by a program (0 can be w ritten).
b3 b2
Set to 0
b1 b0
FMR41
—
(b5-b2)
0
FMR40
FMR42
FMR44
b7 b6 b5 b4
RW
RW
Erase-suspend function
enable bit
(1)
0 : Disables reading
1 : Enables reading
Reserved bit
0 : Disable
1 : Enable
Erase-suspend request bit
(2)
0 : Erase restart
1 : Erase-suspend request
RO
RO
RW
FMR43
Erase command flag 0 : Erase not executed
1 : During erase execution
RO
0 : Disable
1 : Enable
FMR46
Program-suspend request bit
(3)
0 : Program restart
1 : Program-suspend request
Set the FMR01 bit in the FMR0 register to 0 (CPU rew rite mode disabled) in low -pow er-consumption read mode.
In high-speed clock mode and high-speed on-chip oscillator mode, set the FMR47 bit to 0 (disabled).
Program command flag 0 : Program not executed
1 : During program execution
RO
The FMR42 bit is enabled only w hen the FMR40 bit is set to 1 (enable) and programming to the FMR42 bit is enabled
until the auto-program ends since the program command is generated. (This bit is set to 0 during periods other than
above.)
In EW0 mode, 0 or 1 can be programmed to the FMR42 bit by a program.
In EW1 mode, the FMR42 bit is automatically set to 1 by generating a maskable interrupt during the auto-program
w hen the FMR40 bit is set to 1. 1 cannot be programmed to the FMR42 bit by a program.
FMR47
Read status flag
RW
Low -pow er consumption read
mode enable bit
(1,4)

Renesas R8C/20 Specifications

General

Brand	Renesas
Model	R8C/20
Category	Control Unit
Language	English