R8C28_10 Datasheet, PDF (51/73 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MCU

R8C/28 Group, R8C/29 Group
5. Electrical Characteristics
Table 5.37 Flash Memory (Program ROM) Electrical Characteristics
Symbol
−
−
−
td(SR-SUS)
−
−
−
−
−
−
−
Parameter
Program/erase endurance⁽²⁾
Byte program time
Block erase time
Time delay from suspend request until
suspend
Interval from erase start/restart until
following suspend request
Interval from program start/restart until
following suspend request
Time from suspend until program/erase
restart
Program, erase voltage
Read voltage
Program, erase temperature
Data hold time⁽⁷⁾
Conditions
R8C/28 Group
R8C/29 Group
Ambient temperature = 55°C
Min.
100⁽³⁾
1,000⁽³⁾
−
−
−
650
0
−
2.7
2.7
0
20
Standard
Typ.
Max.
−
−
−
−
50
400
0.4
9
− 97 + CPU clock
× 6 cycles
−
−
Unit
times
times
µs
s
µs
µs
−
−
ns
− 3 + CPU clock µs
× 4 cycles
−
5.5
V
−
5.5
V
−
60
°C
−
−
year
NOTES:
1. VCC = 2.7 to 5.5 V at Topr = 0 to 60°C, unless otherwise specified.
2. 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 1,000), each block can be erased n times. For example, if 1,024
1-byte writes are performed to different addresses in 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).
3. Endurance to guarantee all electrical characteristics after program and erase. (1 to Min. value can be guaranteed).
4. 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. It is also advisable to retain data on the erasure endurance of each block and limit
the number of erase operations to a certain number.
5. 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.
6. Customers desiring program/erase failure rate information should contact their Renesas technical support representative.
7. The data hold time includes time that the power supply is off or the clock is not supplied.
Rev.2.10 Sep 26, 2008 Page 49 of 67
REJ03B0169-0210