NEC PD703114, User Manual

Page: 658 / 692

CHAPTER 16 ELECTRICAL SPECIFICATIONS
658
User’s Manual U15195EJ5V0UD
16.2 Flash Memory Programming Mode
Basic Characteristics (T
A
=10 to 40
°
C (during rewrite), T
A
= –40 to +85
°
C (except during rewrite),
REGIN = 3.0 to 3.6 V, V
DD
= RV
DD
= 5.0 V
±
0.5 V, V
SS3
= V
SS
= CV
SS
= 0 V)
Parameter Symbol Conditions MIN. TYP. MAX. Unit
Operating frequency f
X
4 40 MHz
V
PP1
During flash memory programming 7.5 7.8 8.1 V
V
PPL
V
PP
low-level detection
−
0.3 0.2REGIN V
V
PPM
V
PP
, REGIN level detection 0.65REGIN REGIN + 0.3 V
V
PP
supply voltage
V
PPH
V
PP
high-voltage level detection 7.5 7.8 8.1 V
V
DD3
supply current I
DD1
V
PP
= V
PP1
3.2f
XX
+ 30 mA
V
PP
supply current I
PP
V
PP
= 7.8 V 100 mA
Step erase time t
ER
Note 1 0.398 0.4 0.402 s
Overall erase time t
ERA
When the step erase time =
0.4 s, Note 2
40 s
Write-back time t
WB
Note 3 0.99 1 1.01 ms
Number of write-backs per
write-back command
C
WB
When the write-back time =
1 ms, Note 4
300 Count/
write-back
command
Number of erase/write-backs C
ERWB
16 Count
Step writing time t
WT
Note 5 18 20 22
µ
s
Overall writing time per word t
WTW
When the step writing time =
20
µ
s (1 word = 4 bytes), Note 6
20 200
µ
s/word
Number of rewrites C
ERWR
1 erase + 1 write after erase =
1 rewrite, Note 7
100 Count
Notes 1. The recommended setting value of the step erase time is 0.4 s.
2. The prewrite time prior to erasure and the erase verify time (write-back time) are not included.
3. The recommended setting value of the write-back time is 1 ms.
4. Write-back is executed once by the issuance of the write-back command. Therefore, the retry count must
be the maximum value minus the number of commands issued.
5. The recommended setting value of the step writing time is 20
µ
s.
6. 20
µ
s is added to the actual writing time per word. The internal verify time during and after the writing is not
included.
7. When writing initially to shipped products, it is counted as one rewrite for both “erase to write” and “write
only”.
Example (P: Write, E: Erase)
Shipped product
→
P
→
E
→
P
→
E
→
P: 3 rewrites
Shipped product
→
E
→
P
→
E
→
P
→
E
→
P: 3 rewrites
Remark When the PG-FP4 is used, a time parameter required for writing/erasing by downloading parameter files is
automatically set. Do not change the settings unless otherwise specified.