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參數(shù)資料
| 型號(hào)： | SAB-C541U-1EN |
| 廠商： | SIEMENS A G |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PQCC44 |
| 文件頁(yè)數(shù)： | 16/65頁(yè) |
| 文件大?。?/td> | 427K |
| 代理商： | SAB-C541U-1EN |
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Semiconductor Group
16
1997-10-01
C540U
C541U
The oscillator and clock generation circuitry of the C540U/C541U is shown in
figure 5-8
. The crystal
oscillator generates the system clock for the microcontroller. The USB module can be provided with
the following clocks :
– Full speed operation : 48 MHz with a data rate of 12 Mbit/s
– Low speed operation : 6 MHz with a data rate of 1.5 Mbit/s
The low speed clock is generated by a dividing the system clock by 2. The full speed clock is
generated by a PLL, which multiplies the system clock by a fix factor of 4. This PLL can be enabled
or disabled by bit PCLK of SFR DCR. Depending on full or low speed operation of the USB bit
SPEED of SFR has to be set or cleared for the selection of the USB clock. Bit UCLK is a general
enable bit for the USB clock.
Figure 8
Block Diagram of the Clock Generation Circuitry
Crystal
Oscillator
Pin
Pin
XTAL1
12 MHz
6 MHz
Enable
PCLK
DCR.0
12 MHz
XTAL2
by 2
Divider
PLL
x 4
48 MHz
SPEED
DCR.7
UCLK
DCR.1
to USB
Module
System Clock
of the
Microcontroler
C540U / C541U
1
0
MCB03377
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