M16C6N4 Datasheet, PDF (270/406 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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M16C/6N Group (M16C/6N4)
21. Flash Memory Version
21.1 Memory Map
The flash memory contains the user ROM area and a boot ROM area. The user ROM area has space to
store the microcomputer operating program in single-chip mode or memory expansion mode and a separate
4-Kbyte space as the block A.
Figure 21.1 shows the block diagram of flash memory.
The user ROM area is divided into several blocks, each of which can individually be protected (locked)
against programming or erasure. The user ROM area can be rewritten in all of CPU rewrite, standard serial
I/O mode, parallel I/O mode and CAN I/O mode. Block A is enabled for use by setting the PM10 bit in the
_______
PM1 register to “1” (block A enabled. CS2 area at addresses 10000h to 26FFFh).
The boot ROM area is located at the same addresses as the user ROM area. It can only be rewritten in
parallel I/O mode (refer to 21.1.1 Boot Mode). A program in the boot ROM area is executed after a hardware
reset occurs while an “H ” signal is applied to the CNVSS and P5_0 pins and an “L” signal is applied to the
P5_5 pin (refer to 21.1.1 Boot Mode). A program in the user ROM area is executed after a hardware reset
occurs while an “L” signal is applied to the CNVSS pin. However, the boot ROM area cannot be read.
00F000h
00FFFFh
0C0000h
Block A: 4 Kbytes ⁽¹⁾
Block 8: 64 Kbytes
0CFFFFh
0D0000h
Block 7: 64 Kbytes
0F0000h
Block 5: 32 Kbytes
0DFFFFh
0E0000h
0F7FFFh
0F8000h
Block 6: 64 Kbytes
0F9FFFh
0FA000h
0EFFFFh
0F0000h
Block 5 to 0
(32+8+8+8+4+4) Kbytes
0FFFFFh
0FBFFFh
0FC000h
0FDFFFh
0FE000h
0FEFFFh
0FF000h
0FFFFFh
User ROM area
Block 4: 8 Kbytes
Block 3: 8 Kbytes
Block 2: 8 Kbytes
Block 1: 4 Kbytes
Block 0: 4 Kbytes
0FF000h
0FFFFFh
4 Kbytes
Boot ROM area ⁽²⁾
* Shown here is a block diagram during single-chip mode.
NOTES:
1. Block A can be made usable by setting the PM10 bit in the PM1 register to "1" (block A enabled, addresses
10000h to 26FFFh for CS2 area).
Block A cannot be erased by the erase all unlocked block command. Use the block erase command to
erase it.
2. The boot ROM area can only be rewritten in parallel I/O mode.
3. To specify a block, use an even address in that block.
Figure 21.1 Flash Memory Block Diagram
21.1.1 Boot Mode
The microcomputer enters boot mode when a hardware reset occurs while an “H ” signal is applied to the
CNVSS and P5_0 pins and an “L ” signal is applied to the P5_5 pin. A program in the boot ROM area is
executed.
In boot mode, the FMR05 bit in the FMR0 register selects access to the boot ROM area or the user ROM area.
The rewrite control program for standard serial I/O mode is stored in the boot ROM area before shipment.
The boot ROM area can be rewritten in parallel I/O mode only. If any rewrite control program using erase-
write mode (EW0 mode) is written in the boot ROM area, the flash memory can be rewritten according to
the system implemented.
Rev.2.30 Oct 24, 2005 page 252 of 376
REJ09B0009-0230