參數(shù)資料
型號: AT85C51SND3B1-RTTUL
廠商: Atmel
文件頁數(shù): 41/119頁
文件大小: 0K
描述: IC DECODER/ENCODER DGTL 100-LQFP
標(biāo)準(zhǔn)包裝: 90
類型: 音頻編碼器/解碼器
應(yīng)用: 移動電話,手機(jī),視頻顯示器
電壓 - 電源,數(shù)字: 1.65 V ~ 3.6 V
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP
供應(yīng)商設(shè)備封裝: 100-LQFP(14x14)
包裝: 托盤
28
AT85C51SND3B
7632D–MP3–01/07
Clock Controller
The clock controller implemented in AT85C51SND3B derivatives is based on an on-chip
oscillator feeding two on-chip Phase Lock Loop (PLL) dedicated for the USB controller
(see Section “USB Controller”, page 85) and the Audio Controller (see Section “Audio
Controller”, page 149). All internal clocks to the peripherals and CPU core are gener-
ated by this controller.
Oscillator
X1 and X2 pins are the input and the output of a frequency power-optimized single-
stage on-chip inverter (see Figure 15) that can be configured with off-chip components
such as a Pierce oscillator (see Figure 16). Value of capacitors and crystal characteris-
tics are detailed in the Section “DC Characteristics”, page 242.
Authorized frequency
In order to be able to be able to properly detect the oscillating frequency when in In Sys-
tem Programming mode and then generate the 480MHz requested for USB connection,
only the following frequencies are authorized:
12MHz, 13MHz, 16MHz, 19.2MHz, 19.5MHz, 20MHz, 24MHz and 26MHz.
Power Optimization
In order to optimize the power consumption, oscillator gain can be adjusted by software
depending on the crystal frequency. Such optimization is done after reset using
OSCF1:0 bits in CKCON register (see Table 31) according to Table 23. Moreover if
external frequency signal is input (X1 driven by a remote host) it is possible to switch off
the internal amplifier by setting the OSCAMP bit in CKCON register as shown in
Table 23. Oscillator Frequency Configuration
The oscillator outputs a clock: the oscillator clock used to feed the clock generator and
the system clock generator.
The oscillator clock can be disabled by entering the power-down reduction mode as
detailed in the Section “Power Management”, page 19.
Figure 15. Oscillator Block Diagram and Symbol
OSCF1:0
Crystal Clock Frequency Range (F
OSC)
00
22 - 26 MHz (default)
01
18 - 22 MHz
10
14 - 18 MHz.
11
10 - 14 MHz
OSCF1:0
CKCON4:3
X1
X2
PD
PCON.1
OSC
CLOCK
Oscillator Clock Symbol
Oscillator
Clock
OSCAMP
CKCON.5
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