參數(shù)資料
型號: ELANSC400ANDELANSC410
廠商: Advanced Micro Devices, Inc.
英文描述: Single Synchronous Buck Pulse-Width Modulation (PWM) Controller; Temperature Range: 0&degC to 70°C; Package: 14-SOIC T&R
中文描述: ElanSC400和ElanSC410 -單芯片。低功耗。的PC / AT兼容微控制器
文件頁數(shù): 80/132頁
文件大?。?/td> 2400K
代理商: ELANSC400ANDELANSC410
80
élanSC400 and élanSC410 Microcontrollers Data Sheet
Figure 8.
Intermediate and Low-Speed PLLs Block Diagram
Graphics Dot Clock PLL (élanSC400 Microcontroller Only)
The input clock to the Graphics Dot Clock PLL is the
output clock (36.864 MHz) of the Low-Speed PLL di-
vided by 16. The Graphics Dot Clock PLL is not sup-
ported on the élanSC410 microcontroller. The output
frequency is programmable using three extended reg-
ister bits (PLLRATIO[2–0]) in the range of 20.736 MHz
to 36.864 MHz (spaced 2.304 MHz apart). These three
bits (in graphics index register 4Ch) control the output
frequency by selecting the divide value in the feedback
divider as shown in Table 27.
The Graphics Dot Clock PLL requires a stabilization
period after changing frequency. Figure 9 shows the
block diagram for the Graphics Dot Clock PLL.
Phase
Detector
Down
Up
Charge
Pump
Loop
Filter
VCO
Vc
Divider
Reference
Frequency
(Fr)
(Ff)
VCCA
Feedback
Frequency
Frequency Output (Fo)
Internal
External
C
1
R
C
2
Table 27.
Frequency Selection Control for
Graphics Dot Clock PLL
PLLRATIO[2–0]
Divider
Output Frequency
(MHz)
20.736
23.04
25.344
27.648
29.952
32.256
34.56
36.864
000
001
010
011
100
101
110
111
9
10
11
12
13
14
15
16
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