Vicom Systems FC-FC3 Instrukcja Użytkownika Pobierz pdf (Strona 65)

CONFIDENTIAL [AK8999A/AW/AD]

MS1600-E-00 2014/05

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b) OSC variable ratio storing register (Register name: CM2)

This register is used for adjustment of the oscillator frequency of AK8999A. The counted value in

the internal counter is stored. Since the internal counter is overflowing when a count value shows

FF hex, measure again by re-defining High level period.

This register is read only. In addition, the value of the register returns to the initial value on the

following conditions.

■ At the power up

■ When CM1 register is written

■ When CSCLK = Low is maintained 0.5msec or more

■ When ETST[0] is set to "L"

Address : 01 hex D[7:0] = CT[7:0]

(This is not a nonvolatile EEPROM, but a volatile register.)

CT[7:0] Count value Ratio

Description

Dec Hex Bin (time) (%)

0 00 00000000 0 0 Default

1 01 00000001 1 -99

：：：：

：

98 62 01100010 98 -2

99 63 01100011 99 -1

100 64 01100100 100 0 Ideal value

101 65 01100101 101 1

102 66 01100110 102 2

：：：：：

254 FE 11111110 254 154

255 FF 11111111 - - Counter error

1 2 ... 60 61 62 63 64 65 66 67 68

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Vicom Systems FC-FC3 Instrukcja Użytkownika Strona 65