參數(shù)資料
型號(hào)： ELANSC410-66AI
廠商： ADVANCED MICRO DEVICES INC
元件分類(lèi)： 微控制器/微處理器
英文描述： Single-Chip, Low-Power, PC/AT-Compatible Microcontrollers
中文描述： 32-BIT, FLASH, 66 MHz, MICROCONTROLLER, PBGA292
封裝： PLASTIC, BGA-292
文件頁(yè)數(shù)： 76/132頁(yè)
文件大小： 2400K
代理商： ELANSC410-66AI
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76
élanSC400 and élanSC410 Microcontrollers Data Sheet
CLOCKING
Clock Generation
The élanSC400 and élanSC410 microcontrollers re-
quire only one 32.768-kHz crystal to generate all the
other clock frequencies required by the system. The
output of the on-chip crystal oscillator circuit is used to
generate the various frequencies by utilizing four
Phase-Locked Loop (PLL) circuits. The PLL clock dis-
tribution scheme is shown in Figure 4. Table 26 shows
all the PLL output frequencies and their usage. (Note
that these four PLL circuits are in addition to the inter-
nal CPU PLL and do not replace it.)
The crystal oscillator needs two pins, but it does not re-
quire any external components except the crystal; the
load capacitors and the feedback resistor are inte-
grated on-chip.
The four PLLs are called Intermediate PLL, Low-Speed
PLL, High-Speed PLL, and Graphics Dot Clock PLL.
Each of the integrated phase-locked loops has a dedi-
cated pin to support the required external loop filter.
These pins are: LF_INT (Intermediate PLL), LF_LS
(Low-Speed PLL), LF_HS (High-Speed PLL), and
LF_VID (Graphics Dot Clock PLL). (The LF_VID pin is
not supported on the élanSC410 microcontroller.) Two
capacitors and one resistor are required to implement
each loop filter.
Figure 4.
Clock Generation Block Diagram
Notes:
On the élanSC400 microcontroller, the graphics controller’s DRAM interface is clocked by the 66-MHz DRAM clock.
Both the ROM/Flash memory interface and the PC Card controller are clocked from the CPU clock. They also have the option
to be run from the slow system clock.
Neither the graphics controller nor the PC Card controller are supported on the élanSC410 microcontroller.
32.768-kHz
Crystal
Oscillator
Intermediate
PLL
Low-Speed
PLL
Graphics
Dot Clock
PLL
High-Speed
PLL
20.736–
36.864 MHz
32.768 kHz
66.3552 MHz
1.47456 MHz
36.864 MHz
Real-Time
Clock
PMU
UART
Timer
Graphics
Controller
ISA Bus
DRAM
Controller
DMA
Controller
CPU and
VL-Bus
Controller
D
D
DRAM
Controller
ROM/Flash
Interface
PC Card
Controller
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