38D2 datasheet(71/136 Pages) RENESAS

71 / 136 page

Rev.3.02

Apr 10, 2008

Page 71 of 131

REJ03B0177-0302

38D2 Group

FLASH MEMORY MODE

The 38D2 Group 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). For details of each mode, refer to the

next and after pages. Contact the manufacturer of your

programmer for the programmer. Refer to the user's manual of

your programmer for details on how to use it.

This flash memory version has some blocks on the flash memory

as shown in Figure 70 and each block can be erased.

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

operation 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

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

mode.

Performance overview

Table 15 lists the performance overview of the 38D2 Group flash

memory version.

NOTE:

1. 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.

Table 15 Performance overview of 38D2 Group flash memory version

Parameter

Function

Power source voltage (Vcc)

VCC = 2.7 to 5.5 V

Program/Erase VPP voltage (VPP)VCC = 2.7 to 5.5 V

Flash memory mode

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

rewrite mode

Erase block division

User ROM area/Data ROM area

Refer to Figure 70.

Boot ROM area (1)

Not divided (4K bytes)

Program method

In units of bytes

Erase method

Block erase

Program/Erase control method

Program/Erase control by software command

Number of commands

5 commands

Number of program/Erase times

100

ROM code protection

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

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