M16C1N Datasheet, PDF (193/238 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/10 SERIES

M16C/1N Group
19. Flash Memory Version
(11) FMR 41bit
In EW0 mode, when setting the FMR41 bit to "1" by software during auto erasing, the microcomputer
shifts to the erasure-suspend mode.
In EW1 mode, when occurring the enabled interrupt request, the FMR 41bit changes to "1" (Suspend-
request) automatically and the microcomputer shifts to the erasure-suspend mode.
Setting the FMR41 bit to "0" (Erase restart), auto erasing is resumed.
(12) FMR46bit
The FMR46 bit is "0" during auto erasing and is "1" during the erasure-suspend mode.
The internal flash memory is banned to access while the FMR41 bit is "0".
Flash memory control register 0
b7 b6 b5 b4 b3 b2 b1 b0
00
Symbol
FMR0
Address
01B716
After reset
XX0000012
Bit symbol
Bit name
Function
RW
FMR00 RY/BY status flag
0 : Busy (being written or erased)
1 : Ready
RO
FMR01
CPU rewrite mode select bit
(Note 1)
0 : Disables CPU rewrite mode
1 : Enables CPU rewrite mode
RW
FMR02
Block 0, 1
rewrite-enable bit (Note 2)
0 : Disables rewriting
1 : Enables rewriting
RW
FMSTP Flash memory stop bit
(Note 3, 4)
0 : Enables flash memory operation
1 : Stops flash memory operation
(placed in low power mode,
RW
flash memory initialized)
(b4)
Reserved bit
Set to "0"
RW
FMR05 User ROM area select bit
0 : Boot ROM area is accessed
(Effective in only boot mode) 1 : User ROM area is accessed
RW
(Note 3)
FMR06 Program status flag (Note 5) 0 : Terminated normally
1 : Terminated in error
RO
FMR07 Erase status flag (Note 5)
0 : Terminated normally
1 : Terminated in error
RO
Note 1: When setting this bit to "1", write a "0" and then a "1" in to it in succession. Make sure no interrupts will occur
before completion of these two write operations.
In EW0 mode, write this bit by a program placed to an area other than internal flash memory.
Set this bit to "0" after placing in read array mode.
Note 2: When setting this bit to "1", write a "0" and then a "1" in to it in succession while the FMR01 bit is "1". Make sure
no interrupts will occur before completion of these two write operations.
Note 3: Write this bit by a program placed to an area other than internal flash memory.
Note 4: This bit is valid when the FMR01 bit is "1" (CPU rewrite mode). When the FMR01 bit is "0", although the FMSTP
bit can be set to "1" by writing "1" in a program, the flash memory is not initialized.
Note 5: This bit is cleared to "0" by executing the clear status command.
Figure 19.4 FMR0 Register
Rev.1.00 Oct 20, 2004 page 181 of 222
REJ09B0007-0100Z