Rainbow Electronics DS89C450 User Manual
Page 33
DS89C430/DS89C440/DS89C450 Ultra-High-Speed Flash Microcontrollers
33 of 48
Table 8. Page Mode 1, Data Memory Cycle Stretch Values
(PAGES1:PAGES0 = 00)
RD/WR PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)
MD2:MD0
STRETCH
CYCLES
4X/
2X, CD1,
CD0 = 100
4X/
2X, CD1,
CD0 = 000
4X/
2X, CD1,
CD0 = X10
4X/
2X, CD1,
CD0 = X11
000 0 0.25
0.5
1
1024
001 1 0.75
1.5
3
3072
010 2 1.75
3.5
7
7168
011 3 2.75
5.5
11
11,264
100 7 3.75
7.5
15
15,360
101 8 4.75
9.5
19
19,456
110 9 5.75
11.5
23
23,552
111 10 6.75
13.5
27
27,648
Table 9. Page Mode 1, Data Memory Cycle Stretch Values
(PAGES1:PAGES0 = 01)
RD/WR PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)
MD2:MD0
STRETCH
CYCLES
4X/
2X, CD1,
CD0 = 100
4X/
2X, CD1,
CD0 = 000
4X/
2X, CD1,
CD0 = X10
4X/
2X, CD1,
CD0 = X11
000 0 0.25
0.5
1
1024
001 1 0.75
1.5
3
3072
010 2 1.75
3.5
7
7168
011 3 2.75
5.5
11
11,264
100 7 3.75
7.5
15
15,360
101 8 4.75
9.5
19
19,456
110 9 5.75
11.5
23
23,552
111 10 6.75
13.5
27
27,648
Table 10. Page Mode 1, Data Memory Cycle Stretch Values (PAGES1:PAGES0 = 10)
RD/WR PULSE WIDTH (IN NUMBER OF OSCILLATOR CLOCKS)
MD2:MD0
STRETCH
CYCLES
4X/
2X, CD1,
CD0 = 100
4X/
2X, CD1,
CD0 = 000
4X/
2X, CD1,
CD0 = X10
4X/
2X, CD1,
CD0 = X11
000 0
0.5
1
2
2048
001 1
1
2
4
4096
010 2
2
4
8
8192
011 3
3
6
12
12,288
100 7
4
8
16
16,384
101 8
5
10
20
20,480
110 9
6
12
24
24,576
111 10
7
14
28
28,672