SM320C6455-EP

FIXED-POINT DIGITAL SIGNAL PROCESSOR

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SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008

7.7.3.4 PLL Controller Divider 4 Register

The PLL controller divider 4 register (PLLDIV4) is shown in Figure 7-14and described in Table 7-22.

Besides being used as the EMIFA internal clock, SYSCLK4 is also used in other parts of the system. Disabling this clock will cause unpredictable system behavior. Therefore, the PLLDIV4 register should never be used to disable SYSCLK4.

31

 

 

 

 

16

 

 

 

Reserved

 

 

 

 

 

R-0

 

 

15

14

 

5

4

0

D4EN

 

 

Reserved

 

RATIO

R/W-1

 

 

R-0

 

R/W-3

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

 

 

 

Figure 7-14. PLL Controller Divider 4 Register (PLLDIV4) [Hex Address: 029A 0160]

 

 

Table 7-22. PLL Controller Divider 4 Register (PLLDIV4) Field Descriptions

Bit

Field

Value

Description

 

 

31:16

Reserved

0

Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.

15

D4EN

 

Divider 4 enable bit.

 

 

 

 

0

Divider 4 is disabled. No clock output.

 

 

 

 

1

Divider 4 is enabled.

 

 

14:5

Reserved

0

Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.

4:0

RATIO

0-1Fh

Divider ratio bits.

 

 

 

 

0

÷2. Divide frequency by 2.

 

 

 

 

1h

÷4. Divide frequency by 4.

 

 

 

 

2h

÷6. Divide frequency by 6.

 

 

 

 

3h

÷8. Divide frequency by 8.

 

 

 

 

4h-7h

÷10 to ÷16. Divide frequency by 10 to divide frequency by 16.

 

 

 

8h-1Fh

Reserved, do not use.

 

 

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Texas Instruments SM320C6455-EP manual PLL Controller Divider 4 Register, D4EN