ATAVRISP2 datasheet(20/24 Pages) ATMEL

20 / 24 page

AVR069

8015B-AVR-02/06

Name

Value

Hex

bEndpointAddress

2 OUT

0x02

bmAttributes. TransferType

Bulk

0x2

bmAttributes. Reserved

Zero

0x00

wMaxPacketSize

64 bytes

0x0040

bInterval

Ignored for Bulk endpoints

0x0A

6.3 Setting SCK Frequency

The AVRISP mkII supports the SCK frequencies shown in avrispmkIIfreqs below.

Use the CalcSckDur( ) algorithm to find the PARAM_SCK_DURATION value for a

given frequency:

// frequencies for AVRISP mkII ISP programming

double avrispmkIIfreqs[] = {

8000000, 4000000, 2000000, 1000000, 500000, 250000, 125000,

96386, 89888, 84211, 79208, 74767, 70797, 67227, 64000,

61069, 58395, 55945, 51613, 49690, 47905, 46243, 43244,

41885, 39409, 38278, 36200, 34335, 32654, 31129, 29740,

28470, 27304, 25724, 24768, 23461, 22285, 21221, 20254,

19371, 18562, 17583, 16914, 16097, 15356, 14520, 13914,

13224, 12599, 12031, 11511, 10944, 10431, 9963, 9468,

9081, 8612, 8239, 7851, 7498, 7137, 6809, 6478, 6178,

5879, 5607, 5359, 5093, 4870, 4633, 4418, 4209, 4019,

3823, 3645, 3474, 3310, 3161, 3011, 2869, 2734, 2611,

2484, 2369, 2257, 2152, 2052, 1956, 1866, 1779, 1695,

1615, 1539, 1468, 1398, 1333, 1271, 1212, 1155, 1101,

1049, 1000, 953, 909, 866, 826, 787, 750, 715, 682,

650, 619, 590, 563, 536, 511, 487, 465, 443, 422,

402, 384, 366, 349, 332, 317, 302, 288, 274, 261,

249, 238, 226, 216, 206, 196, 187, 178, 170, 162,

154, 147, 140, 134, 128, 122, 116, 111, 105, 100,

95.4, 90.9, 86.6, 82.6, 78.7, 75.0, 71.5, 68.2,

65.0, 61.9, 59.0, 56.3, 53.6, 51.1

};

UCHAR CalcSckDur(long sckFrequency)

{

UCHAR paramSckDuration;

// Default to slowest value

paramSckDuration = (UCHAR)sizeof(avrispmkIIfreqs)-1;

// Find first frequency that is less than the requested

for (int i = 0; i < sizeof(avrispmkIIfreqs); i++)

{

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