R32C121 datasheet(81/113 Pages) RENESAS

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REJ03B0237-0050 Rev.0.50 Jul 31, 2008

Page 81 of 111

Under development

Preliminary Specification

This is a preliminary specification and is subject to change.

R32C/121 Group

5. Electrical Characteristics

Notes:

Program/erase definition

This value represents the number of erasures per block.

If the flash memory is programmed/erased n times, each block can be erased n times.

i.e. If 4-word write is performed in 512 different addresses in the block A of 4 Kbyte and then the

block is erased, it is considered the programming/erasure is performed just once.

However a write in the same address more than once for one erasure is disabled. (overwrite

disabled).

The data retention time includes the periods when the supply voltage is not applied and no clock is

provided.

This data retention includes 3000 hours in Ta = 125°C and 7000 hours in Ta = 85°C.

Please contact a Renesas sales office regarding data retention time other than the above.

Table 5.8

Flash Memory Electrical Characteristics

(VCC = 3.0 to 5.5 V, VSS =0V, and Ta =Topr, unless otherwise noted)

Symbol

Characteristic

Value

Unit

Min.

Typ.

Max.

—

Programming and erasure endurance of flash

memory (1)

Program area

1000

times

Data area

10000

times

—

4-word program time

Program area

150

900

µs

Data area

300

1700

µs

—

Lock bit-program time

Program area

500

µs

Data area

140

1000

µs

—

Block erasure time

4 Kbyte block

0.12

3.0

32 Kbyte block

0.17

3.0

64 Kbyte block

0.20

3.0

tPS

Flash memory circuit start-up stabilization time

µs

—

Data retention (2)

Ta = 55°C (3, 4)

years

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