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Micro-ISP
Device Programming Guide continued
AT89S/89LS - Timing Characteristics
Voltage
Flash Write
(V)
Time (ms)
3.0
5
3.0
5
3.3
5
3.3
5
3.5
5
3.5
5
4.0
4
4.0
4
4.5
4
4.5
4
5.0
2
5.0
3
5.5
1
5.5
1
6.0
1
6.0
1
For the AT89S/89LS family it is necessary to change both the 'FLASH/EEPROM write times'
and the 'SPI Frequency' depending on target voltage and oscillator frequency. The table
shows results for 4MHz and 12MHz. The AT89S device should program correctly at >4.0V
with a target frequency of 4MHz to 24MHz. The AT89LS should program correctly at 3.0V to
6.0V as long as the target oscillator frequency is 12MHz or below.
IV User Manual V2.03
Series
EEPROM Write
Time (ms)
5
5
5
5
5
5
4
4
4
4
2
3
1
1
1
1
F SPI
F OSC
(KHz)
(MHz)
15
12
15
4
50
12
50
4
100
12
50
4
50
12
100
4
100
12
50
4
100
12
50
4
100
12
50
4
100
12
50
4
13
Code time
Data time
(secs)
(secs)
78.5
12.0
78.5
12.0
56.2
14.0
56.2
14.0
54.3
13.5
56.2
14.0
47.4
12.0
45.1
11.5
45.1
11.5
47.4
12.0
29.0
7.5
38.1
9.5
19.8
5.0
23.1
6.0
19.8
5.0
23.1
6.0
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