R8C datasheet(26/49 Pages) RENESAS

26 / 49 page

R8C/1A Group, R8C/1B Group

5. Electrical Characteristics

Rev.1.40

Dec 08, 2006

Page 26 of 45

REJ03B0144-0140

NOTES:

VCC = 2.7 to 5.5 V at Topr = 0 to 60

°C, unless otherwise specified.

Definition of programming/erasure endurance

The programming and erasure endurance is defined on a per-block basis.

If the programming and erasure endurance is n (n = 100 or 10,000), each block can be erased n times. For example, if 1,024

1-byte writes are performed to block A, a 1 Kbyte block, and then the block is erased, the programming/erasure endurance

still stands at one. However, the same address must not be programmed more than once per erase operation (overwriting

prohibited).

Endurance to guarantee all electrical characteristics after program and erase. (1 to Min. value can be guaranteed).

If emergency processing is required, a suspend request can be generated independent of this characteristic. In that case the

normal time delay to suspend can be applied to the request. However, we recommend that a suspend request with an

interval of less than 650

µs is only used once because, if the suspend state continues, erasure cannot operate and the

incidence of erasure error rises.

In a system that executes multiple programming operations, the actual erasure count can be reduced by writing to sequential

addresses in turn so that as much of the block as possible is used up before performing an erase operation. For example,

when programming groups of 16 bytes, the effective number of rewrites can be minimized by programming up to 128 groups

before erasing them all in one operation. In addition, averaging the number of erase operations between block A and block B

can further reduce the effective number of rewrites. It is also advisable to retain data on the erase count of each block and

limit the number of erase operations to a certain number.

If an error occurs during block erase, attempt to execute the clear status register command, then execute the block erase

command at least three times until the erase error does not occur.

Customers desiring programming/erasure failure rate information should contact their Renesas technical support

representative.

The data hold time includes time that the power supply is off or the clock is not supplied.

Table 5.4

Flash Memory (Program ROM) Electrical Characteristics

Symbol

Parameter

Conditions

Standard

Unit

Min.

Typ.

Max.

−

Program/erase endurance(2)

R8C/1A Group

100(3)

−−

times

R8C/1B Group

1,000(3)

−−

times

−

Byte program time

−

400

µs

−

Block erase time

−

0.4

td(SR-SUS)

Time delay from suspend request until

suspend

−−

97+CPU clock

× 6 cycles

µs

−

Interval from erase start/restart until

following suspend request

650

−−

µs

−

Interval from program start/restart until

following suspend request

−−

−

Time from suspend until program/erase

restart

−−

3+CPU clock

× 4 cycles

µs

−

Program, erase voltage

2.7

−

5.5

−

Read voltage

2.7

−

5.5

−

Program, erase temperature

−

°C

−

Data hold time(8)

Ambient temperature = 55

°C20

−−

year

R8C bảng dữ liệu(PDF) 26 Page - Renesas Technology Corp

R8C bảng dữ liệu(HTML) 26 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

bảng dữ liệu tải về

Link URL