M16C28 Datasheet, PDF (329/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/28 Group (M16C/28, M16C/28B)
18. Flash Memory Version
Flash Memory Control Register 4
b7 b6 b5 b4 b3 b2 b1 b0
0
00 ₀₀
Symbol
FMR4
Address
01B316
After Reset
010000002
Bit Symbol
Bit Name
Function
RW
FMR40
Erase suspend function
enable bit ⁽¹⁾
0: Disabled
1: Enabled
RW
FMR41 ^{Erase suspend}
request bit ⁽²⁾
0: Erase restart
1: Suspend request
RW
(b5-b2) ^{Reserved bit}
Set to “0”
RO
FMR46 ^{Erase status}
0: During auto-erase operation
1: Auto-erase stop
RO
(erase suspend mode)
(b7) ^{Reserved bit}
Set to “0”
RW
NOTES:
1. When setting this bit to “1”, set to “1” immediately after setting it first to “0”. Do not generate an
interrupt or a DMA transfer between setting the bit to “0” and setting it to “1”. Set by a program in a
space other than the flash memory in EW mode 0.
2. This bit is valid only when the erase-suspend enable bit (FMR40) is “1”. Writing is enabled only
between executing an erase command and completing erase (this bit is set to “0” other than the above
duration). This bit can be set to “0” or “1” by a program in EW mode 0. In EW mode 1, this bit is
automatically set to “1” when the FMR40 bit is “1” and a maskable interrupt is generated during
erasing. Do not write to “1” by program (writing “0” is enabled).
Figure 18.8 FMR4 Register
Rev. 2.00 Jan. 31, 2007 ^{page 309} of 385
REJ09B0047-0200