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參數(shù)資料
| 型號： | ELANSC400 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Single-Chip, Low-Power, PC/AT-Compatible Microcontrollers |
| 中文描述： | 單芯片，低功耗的PC / AT兼容微控制器 |
| 文件頁數(shù)： | 81/132頁 |
| 文件大?。?/td> | 2400K |
| 代理商： | ELANSC400 |
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élanSC400 and élanSC410 Microcontrollers Data Sheet
81
Figure 9.
Graphics Dot Clock PLL Block Diagram
High-Speed PLL
The High-Speed PLL generates a 66.3552-MHz clock
for the DRAM controller. Figure 10 on page 82 shows
the block diagram for the High-Speed PLL. The input to
the High-Speed PLL is the output of the Low-Speed
PLL divided by five. The feedback divider is nine, which
results in an output frequency (Fo) of 66.3552 MHz.
This frequency is divided by 2 in the PMU to provide the
33-MHz input for the PLL in the CPU core.
Band Gap Block
The band gap reference circuit generates the bias cur-
rents for the four PLLs and provides a 2.4-V reference
source for the RTC voltage monitor. The current
sources, constant over V
CC
, temperature, and process
variations, are used by the four PLL charge pumps for
adjusting the PLL operating frequency. The 2.4-V refer-
ence voltage is used by the RTC voltage monitor to de-
tect a low backup battery voltage level.
RTC Voltage Monitor
The voltage monitor for the RTC block is shown in
Figure 11 on page 82. Its functions are to provide a
reset signal to the RTC block when it detects a low
backup battery voltage, and to provide an early warn-
ing signal when the system is powering down.
The internal RTC reset signal is asserted on power-up
if the back-up battery voltage drops below 2.4 V. The
one shot prevents multiple resets during power-on.
An internal power-down signal is used by the RTC to
isolate the RTC core from the rest of the
microcontroller. The RTC voltage monitor uses the
RESET assertion to detect a power-down. For proper
operation, RESET and V
CC
must follow the timing in
Figure 12 on page 83.
Down
Up
Charge
Pump
Loop
Filter
VCCA
36.864 MHz
Phase
Detector
Vc
20.736–
36.864 MHz
Fo
Ff
Fr
Divider
(9–16)
/16
VCO
PLLRATIO[2–0]
Programmable
Internal
External
C
1
R
C
2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ELANSC400-100AC | 制造商:Advanced Micro Devices 功能描述:MCU 16-Bit/32-Bit Elan CISC 3.3V 292-Pin BGA |
| ELANSC400-100AI | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip, Low-Power, PC/AT-Compatible Microcontrollers |
| ELANSC400-33AC | 制造商:Advanced Micro Devices 功能描述:MCU 16-Bit/32-Bit Elan CISC ROMLess 3.3V 292-Pin BGA |
| ELANSC400-33AC-REVA3 | 制造商:Advanced Micro Devices 功能描述:MCU 16-Bit/32-Bit Elan CISC ROMLess 3.3V 292-Pin BGA |
| ELANSC400-33AI | 制造商:Advanced Micro Devices 功能描述:MCU 32-bit Elan RISC ROMLess 3.3V 292-Pin BGA |
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