7906 datasheet(382/531 Pages) RENESAS

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FLASH MEMORY VERSION

7906 Group User’s Manual Rev.2.0

19-5

19.1 Overview

In addition to the internal flash memory area (in other words, user ROM area) shown in Figure 19.1.1, the

flash memory version has the boot ROM area of 8 Kbytes.

Figure 19.1.2 shows the memory assignment of the internal flash memory.

The user ROM area is divided into several blocks. The user ROM area is reprogrammed in the flash

memory CPU reprogramming mode, serial I/O mode, and parallel I/O mode.

The boot ROM area is assigned at addresses, overlapping with the user ROM area, however, the boot

ROM area exists in the defferent memory; the boot ROM area can be reprogrammed only in the flash

memory parallel I/O mode. (Refer to section “19.4 Flash memory parallel I/O mode.”). When being reset

with pin MD1 tied to Vcc level and pin MD0 to Vss level, the software in the boot ROM area is executed

after reset. (Refer to section “19.1.3 Boot mode.”) When pin MD1 = Vss level, however, the contents of

the boot ROM area cannot be read out.

Fig. 19.1.2 Memory assignment of internal flash memory

28 Kbytes

16 Kbytes

8 Kbytes

(Note)

User ROM area

Boot ROM area

(In boot mode)

(In flash memory parallel I/O mode)

Note: Addresses FF9016 to FF9F16 are reserved for serial and parallel programmers.

Be sure not to use this area.

100016

7FFF16

800016

BFFF16

C00016

DFFF16

E00016

016

FFFF16

1FFF16

M37906F8

7906 Datasheet(PDF) 382 Page - Renesas Technology Corp