M37542F4GP datasheet(73/122 Pages) RENESAS

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7542 Group

Rev.3.03

Jul 11, 2008

Page 73 of 117

REJ03B0006-0303

Table 9 Summary of 7542 group’s flash memory version

FLASH MEMORY MODE

The 7542 group’s flash memory version has the flash memory that

can be rewritten with a single power source.

For this flash memory, three flash memory modes are available in

which to read, program, and erase: the parallel I/O and standard

serial I/O modes in which the flash memory can be manipulated

using a programmer and the CPU rewrite mode in which the flash

memory can be manipulated by the Central Processing Unit

(CPU).

● Summary

Table 9 lists the summary of the 7542 Group (flash memory ver-

sion).

This flash memory version has some blocks on the flash memory

as shown in Figure 97 and each block can be erased.

In addition to the ordinary User ROM area to store the MCU op-

eration control program, the flash memory has a Boot ROM area

that is used to store a program to control rewriting in CPU rewrite

and standard serial I/O modes. This Boot ROM area has had a

standard serial I/O mode control program stored in it when

shipped from the factory. However, the user can write a rewrite

control program in this area that suits the user’s application sys-

tem. This Boot ROM area can be rewritten in only parallel I/O

mode.

Item

Power source voltage (Vcc)

Temperature at program/erase

Program/Erase VPP voltage (VPP)

Flash memory mode

Erase block division

User ROM area/Data ROM area

Boot ROM area (Note)

Program method

Erase method

Program/Erase control method

Number of commands

Number of program/Erase times

ROM code protection

Specifications

VCC = 2.7 to 5.5 V

Ta = 0 to 60 °C

VCC = 2.7 to 5.5 V

3 modes; Parallel I/O mode, Standard serial I/O mode, CPU rewrite mode

Refer to Fig. 97.

Not divided (4K bytes)

In units of bytes

Block erase

Program/Erase control by software command

5 commands

100

Available in parallel I/O mode and standard serial I/O mode

Note: The Boot ROM area has had a standard serial I/O mode control program stored in it when shipped from the factory.

This Boot ROM area can be erased and written in only parallel I/O mode.

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