Table of Contents
Advertisement
M16C/64C Group
Table 31.10
Flash Memory (Data Flash) Electrical Characteristics
V
= 2.7 to 5.5 V at T
CC1
Symbol
-
Program and erase cycles
-
2 word program time
-
Lock bit program time
-
Block erase time
Time delay from suspend request
t
d(SR-SUS)
until suspend
Interval from erase start/restart until
-
following suspend request
Suspend interval necessary for
-
auto-erasure to complete
Time from suspend until erase
-
restart
-
Program, erase voltage
-
Read voltage
-
Program, erase temperature
t
Flash memory circuit stabilization wait time
PS
-
Data hold time
Notes:
1.
Definition of program and erase cycles
The program and erase cycles refer to the number of per-block erasures.
If the program and erase cycles are n (n = 10,000), each block can be erased n times.
For example, if a 4 KB block is erased after writing 2 word data 1,024 times, each to a different address, this
counts as one program and erase cycles. Data cannot be written to the same address more than once without
erasing the block (rewrite prohibited).
2.
Cycles to guarantee all electrical characteristics after program and erase. (1 to Min. value can be guaranteed).
3.
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 256 groups before erasing them all in one operation. In addition, averaging the
erasure cycles between blocks A and B can further reduce the actual erasure cycles. It is also advisable to retain
data on the erasure cycles of each block and limit the number of erase operations to a certain number.
4.
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.
5.
Customers desiring program/erase failure rate information should contact a Renesas Electronics sales office.
6.
The data hold time includes time that the power supply is off or the clock is not supplied.
7.
After an erase start or erase restart, if an interval of at least 20 ms is not set before the next suspend request, the
erase sequence cannot be completed.
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
= -20 to 85°C/-40 to 85°C, unless otherwise specified.
opr
Parameter
(1), (3), (4)
V
CC1
V
CC1
V
CC1
V
CC1
(7)
(6)
Ambient temperature = 55°C
Conditions
= 3.3 V, T
= 25°C
10,000
opr
= 3.3 V, T
= 25°C
opr
= 3.3 V, T
= 25°C
opr
= 3.3 V, T
= 25°C
opr
−20/−40
31. Electrical Characteristics
Standard
Min.
Typ.
Max.
(2)
300
4000
140
3000
0.2
3.0
3
5
+
--------------- -
f
(
BCLK
0
20
1
30
+
--------------- -
f
(
BCLK
2.7
5.5
2.7
5.5
85
50
20
Page 716 of 807
Unit
times
μs
μs
s
ms
)
μs
ms
μs
)
V
V
°C
μs
year
Advertisement
Table of Contents
