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Low-voltage Serial Programming Characteristics
AT90S/LS2323/2343
46
Figure 37. Low-voltage Serial Programming Timing
MOSI
SCK
MISO
Table 20. Low-voltage Serial Programming Characteristics, T
2.7 - 6.0V (unless otherwise noted)
Symbol
Parameter
1/t
Oscillator Frequency (V
CLCL
t
Oscillator Period (V
CLCL
1/t
Oscillator Frequency (V
CLCL
t
Oscillator Period (V
CLCL
t
SCK Pulse Width High
SHSL
t
SCK Pulse Width Low
SLSH
t
MOSI Setup to SCK High
OVSH
t
MOSI Hold after SCK High
SHOX
t
SCK Low to MISO Valid
SLIV
Table 21. Minimum Wait Delay after the Chip Erase Instruction
Symbol
t
WD_ERASE
Table 22. Minimum Wait Delay after Writing a Flash or EEPROM Location
Symbol
t
WD_PROG
t
t
OVSH
SHOX
t
SHSL
= 2.7 - 4.0V)
CC
= 2.7 - 4.0V)
CC
= 4.0 - 6.0V)
CC
= 4.0 - 6.0V)
CC
3.2V
3.6V
18 ms
14 ms
3.2V
3.6V
9 ms
7 ms
t
SLSH
t
SLIV
= -40 ° C to 85 ° C, V
A
Min
Typ
Max
0
4.0
250.0
0
8.0
125.0
2.0 t
CLCL
2.0 t
CLCL
t
CLCL
2.0 t
CLCL
10.0
16.0
32.0
4.0V
5.0V
12 ms
8 ms
4.0V
5.0V
6 ms
4 ms
1004D–09/01
=
CC
Units
MHz
ns
MHz
ns
ns
ns
ns
ns
ns
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