AN910 datasheet(24/51 Pages) STMICROELECTRONICS

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ST7 AND ST9 PERFORMANCE BENCHMARKING

Table 9. Computing performance global execution time ratios

(1) The 80C51 results are preliminary results. They may changed in later versions.

Table 10. Computing performance global code size ratios

(1) The 80C51 results are preliminary results. They may changed in later versions.

Table 11. Interrupt processing performance execution time values and ratios

Table 12. Interrupt processing performance code size values and ratios

Global execution time

ratios

80C51XA

(20 MHz)

68HC16

(16 MHz)

68HC12

(8 MHz)

ST9+

(25 MHz)

ST9

(12 MHz)

H8/300

(10 MHz)

68HC11

(4 MHz)

68HC08

(8 MHz)

ST7

(8 MHz)

ST7

(4 MHz)

80C51(1)

(20 MHz)

with reduced set of tests

▲

1.90

1.54

1.46

1.00

0.32

0.67

0.26

0.67

0.46

0.23

with full set of tests

▲

1.92

1.47

1.33

1.00

0.32

0.64

Global code size

ratios

80C51XA

(20 MHz)

68HC16

(16 MHz)

68HC12

(8 MHz)

ST9+

(25 MHz)

ST9

(12 MHz)

H8/300

(10 MHz)

68HC11

(4 MHz)

68HC08

(8 MHz)

ST7

(8 MHz)

ST7

(4 MHz)

80C51(1)

(20 MHz)

with reduced set of tests

0.95

1.04

▲

0.85

1.00

0.98

1.10

1.24

1.21

▼

1.50

with full set of tests

0.94

1.03

▲

0.90

1.00

1.04

Execution time

values (µs) and ratios

80C51XA

(20 MHz)

68HC16

(16 MHz)

68HC12

(8 MHz)

ST9+

(25 MHz)

ST9

(12 MHz)

H8/300

(10 MHz)

68HC11

(4 MHz)

68HC08

(8 MHz)

ST7

(8 MHz)

ST7

(4 MHz)

80C51

(20 MHz)

interrupt latency & return

3.15

4.19

3.75

▲

2.40

7.17

3.90

▼

21.75

2.88

3.88

7.75

8.40

execution time values

4.70

7.56

6.25

▲

4.08

12.00

8.70

▼

17.25

5.25

6.50

13.00

10.80

execution time ratios

0.87

0.54

0.65

▲

1.00

0.34

0.47

▼

0.19

0.78

0.63

0.31

0.38

Code size

values and ratios

80C51XA

(20 MHz)

68HC16

(16 MHz)

68HC12

(8 MHz)

ST9+

(25 MHz)

ST9

(12 MHz)

H8/300

(10 MHz)

68HC11

(4 MHz)

68HC08

(8 MHz)

ST7

(8 MHz)

ST7

(4 MHz)

80C51

(20 MHz)

code size values (bytes)

28.5

▼

16.5

19.5

▲

13.5

16.5

19.5

code size ratios

1.46

▼

1.85

0.85

1.00

1.70

▲

0.69

0.82

0.85

1.00

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