DS89C420 Datasheet, PDF (29/59 Pages) Dallas Semiconductor – Ultra-High-Speed Microcontroller

DS89C420
Table 9. Page Mode 1, Data Memory Cycle Stretch Values
(Pages1:Pages0 = 01)
MD2:MD0
000
001
010
011
100
101
110
111
STRETCH
CYCLES
0
1
2
3
7
8
9
10
RD _/ WR _{PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)}
4X/2X, CD1,
CD0 = 100
4X/2X, CD1,
CD0 = 000
4X/2X, CD1,
CD0 = X10
4X/2X, CD1,
CD0 = X11
0.25
0.5
1
1024
0.75
1.5
3
3072
1.75
3.5
7
7168
2.75
5.5
11
11,264
3.75
7.5
15
15,360
4.75
9.5
19
19,456
5.75
11.5
23
23,552
6.75
13.5
27
27,648
Table 10. Page Mode 1, Data Memory Cycle Stretch Values
(Pages1:Pages0 = 10)
MD2:MD0
STRETCH
CYCLES
000
0
001
1
010
2
011
3
100
7
101
8
110
9
111
10
RD _/ WR _{PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)}
4X/2X, CD1,
CD0 = 100
4X/2X, CD1,
CD0 = 000
4X/2X, CD1,
CD0 = X10
4X/2X, CD1,
CD0 = X11
0.5
1
2
2048
1
2
4
4096
2
4
8
8192
3
6
12
12,288
4
8
16
16,384
5
10
20
20,480
6
12
24
24,576
7
14
28
28,672
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