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FLASH MEMORY VERSION

7906 Group User’s Manual Rev.2.0

19-2

19.1 Overview

The flash memory version is provided with the same function as that of the mask ROM version except that

the former includes the flash memory. Note that, however, part of the SFR area of the flash memory version

differs from that of the mask ROM version. (Refer to section “19.1.1 Memory assignment.”) Also, the stop

mode terminate operation of the flash memory version differs from that of the mask ROM version. (Refer

to section “19.1.2 Single-chip mode.”)

In the flash memory version, its internal flash memory can be handled in the following three reprogramming

modes: flash memory CPU reprogramming mode, flash memory serial I/O mode, and flash memory parallel

I/O mode.

Table 19.1.1 lists the performance overview of the flash memory version. (For the items not listed in Table

19.1.1, see Table 1.1.1.)

Table 19.1.1 Performance overview of flash memory version

Item

Performance

Power source voltage

Programming/Erase voltage

Flash memory reprogramming modes

Programming

Erase method

Maximum number of reprograms (programming

and erasure)

5 V ± 0.5 V

Flash memory CPU reprogramming mode,

Flash memory serial I/O mode,

Flash memory parallel I/O mode

Programmed in a unit of word

Programmed in a unit of byte

Block erase or Total erase

100

For the flash memory version, in addition to the same single-chip mode as that of the mask ROM version,

any of the operating modes listed in Table 19.1.2 can further be selected by the voltage levels applied to

pins MD1 and MD0. Table 19.1.3 also lists the overview of flash memory reprogramming modes.

Note: Do not switch the voltages applied to pins MD0 and MD1 while the microcomputer is active.

Table 19.1.2 Operating mode selection according to

voltages applied to pins MD0 and MD1

Single-chip mode

– (Note 1)

Boot mode (Note 2)

Flash memory parallel I/O mode

(Note 3)

VSS

VCC

VSS

VCC

MD1

VSS

VCC

MD0

Operating modes

Notes 1: Do not select.

2: Refer to section “19.1.3 Boot mode.”

3: Refer to section “19.4 Flash memory parallel

I/O mode.”

CPU reprogramming mode,

Flash memory serial I/O mode

Flash memory Parallel I/O mode

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