R28 datasheet(360/473 Pages) RENESAS

360 / 473 page

R8C/28 Group, R8C/29 Group

19. Flash Memory

Rev.2.10

Sep 26, 2008

Page 341 of 441

REJ09B0279-0210

19.2

Memory Map

The flash memory contains a user ROM area and a boot ROM area (reserved area).

Figure 19.1 shows the Flash Memory Block Diagram for R8C/28 Group. Figure 19.2 shows a Flash Memory Block

Diagram for R8C/29 Group.

The user ROM area of the R8C/29 Group contains an area (program ROM) which stores MCU operating programs

and blocks A and B (data flash) each 1 Kbyte in size.

The user ROM area is divided into several blocks. The user ROM area can be rewritten in CPU rewrite mode and

standard serial I/O and parallel I/O modes.

When rewriting blocks 0 and 1 in CPU rewrite mode, set the FMR02 bit in the FMR0 register to 1 (rewrite

enabled). When the FMR15 bit in the FMR1 register is set to 0 (rewrite enabled), block 0 is rewritable. When the

FMR16 bit is set to 0 (rewrite enabled), block 1 is rewritable.

The rewrite control program for standard serial I/O mode is stored in the boot ROM area before shipment. The boot

ROM area and the user ROM area share the same address, but have separate memory areas.

Figure 19.1

Flash Memory Block Diagram for R8C/28 Group

Boot ROM area

(reserved area)(2)

8 Kbytes

0E000h

0FFFFh

User ROM area

Block 0: 8 Kbytes(1)

0E000h

0FFFFh

Block 0: 16 Kbytes(1)

0C000h

0FFFFh

16 Kbyte ROM product

Program ROM

8 Kbyte ROM product

Boot ROM area

(reserved area)(2)

User ROM area

8 Kbytes

0E000h

0FFFFh

08000h

Block 1: 16 Kbytes(1)

Block 0: 16 Kbytes(1)

0BFFFh

0C000h

0FFFFh

32 Kbytes ROM product

Program ROM

NOTES:

1. When the FMR02 bit in the FMR0 register is set to 1 (rewrite enabled) and the FMR15 bit in the FMR1 register is set to 0

(rewrite enabled), block 0 is rewritable. When the FMR16 bit is set to 0 (rewrite enabled), block 1 is rewritable (only for CPU

rewrite mode).

2. This area is for storing the boot program provided by Renesas Technology.

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