參數(shù)資料
型號(hào): 73S1217F-68MR/F/PE
廠商: Maxim Integrated Products
文件頁數(shù): 59/140頁
文件大?。?/td> 0K
描述: IC SOC SMART CARD READER 68QFN
標(biāo)準(zhǔn)包裝: 2,500
系列: *
DS_1217F_002
73S1217F Data Sheet
Rev. 1.2
25
MPU Clock Control Register (MPUCKCtl): 0xFFA1
0x0C
Table 13: The MPUCKCtl Register
MSB
LSB
MDIV.5 MDIV.4 MDIV.3 MDIV.2 MDIV.1 MDIV.0
Bit
Symbol
Function
MPUCKCtl.7
MPUCKCtl.6
MPUCKCtl.5
MDIV.5
This value determines the ratio of the MPU master clock frequency to
the VCO frequency (MCLK) such that
MPUClk = MCLK/(2 * (MPUCKDiv(5:0) + 1)).
Do not use values of 0 or 1 for MPUCKDiv(n).
Default is 0Ch to set CPCLK = 3.6923MHz.
MPUCKCtl.4
MDIV.4
MPUCKCtl.3
MDIV.3
MPUCKCtl.2
MDIV.2
MPUCKCtl.1
MDIV.1
MPUCKCtl.0
MDIV.0
The oscillator circuits are designed to connect directly to standard parallel resonant crystal in a Pierce
oscillator configuration. Each side of the crystal should include a 22pF capacitor to ground for both
oscillator circuits and a 1M resistor is required across the 12MHz crystal.
The CPU clock is available as an output on pin CPUCLK.
73S1217F
X1
2I
N
X12
O
UT
X32I
N
X32
O
UT
12MHz
22pF
32KHz
1M
Ω
Note: The crystals should be placed as close as possible to the IC, and vias should be avoided.
Figure 4: Oscillator Circuit
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