YMF795 Просмотр технического описания (PDF) - Yamaha Corporation

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YMF795

Automobile sound Player-2

Yamaha Corporation 

YMF795

$39h Clock setting

Default: 0000h

Index b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

$39h

0

0

0

0

00

0

CLKSET

The register is used to set the clock frequency that is input through the CLK_I pin when the setting is made in the

programmable mode. Be sure to complete the setting before its sound generation.

A clock with any frequency can be input during the reset period.

For details of the clock setting, see “Clock Frequency Setting” (page 24).

CLKSET [8:0]

000000000b

000000001b

:

000101111b

000110000b

000110001b

:

111110001b

111110010b

111110011b

:

111111111b

Clock frequency(MHz)

(Preset mode)

Prohibition

:

Prohibition

2.684658000

2.740588375

:

27.797396375

27.853326750

Prohibition

:

Prohibition

The values that can be set to CLKSET are “000000000b”, and “000110000b” to “111110010b.”

When other value is set, the operation is not guaranteed.

A value to set to CLKSET can be found by using the following formula.

CLKSET = Clock frequency [KHz] / 447.443 × 8

For example, when the clock frequency is 3 MHz:

CLKSET = 3000 / 447.443 × 8 is about 54 = 000110110b

And, actual clock frequency to be set is as follows.

Clock frequency [kHz] = 54 × 447.443 / 8 = 3020.24[kHz] = 3.02024[MHz]

-20-

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