參數(shù)資料
型號(hào): M38K07M4L-XXXHP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù): 108/133頁
文件大小: 1359K
代理商: M38K07M4L-XXXHP
38K0 Group
Rev.3.00
Oct 05, 2006
page 76 of 129
REJ03B0192-0300
PLL CIRCUIT (FREQUENCY SYNTHESIZER)
The PLL circuit generates fVCO (PLL output clock), which is re-
quired for fUSB (USB clock) and fSYN (fUSB division clock), from
f(XIN) (external input reference clock). Figure 109 shows the PLL
circuit block diagram.
It is possible to input 6 or 12 MHz clock from the externals as a
standard clock input. When using the USB function, set the PLL
operation mode selection bit so that fvco may be set to 48 MHz.
The PLL circuit operates by setting the PLL operation enable bit to
“1”. When supplying fVCO to the USB block, wait for the oscillation
stable time (1ms or less) of PLL before selecting fVCO with the
USB clock selection bit.
According to the setting of the USB clock division ratio selection
bit, the division clock of fUSB is supplied to fSYN. When using this
clock as system clock, set the USB clock division ratio selection
bit so that it may be set to 6 MHz, 8 MHz or 12 MHz. (However,
using it only when fUSB is 48MHz is recommended).
Fig. 109 Block diagram of PLL circuit
PLL
fUSB
f(XIN)
fVCO
PLLCON
Division circuit
fSYN
(address 0FF816)
USBCON
(address 001016)
相關(guān)PDF資料
PDF描述
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M38K07M4L-XXXFP 8-BIT, MROM, 12 MHz, MICROCONTROLLER, PQFP64
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