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MC9S08DZ96F2CLL bảng dữ liệu(PDF) 208 Page - Freescale Semiconductor, Inc |
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MC9S08DZ96F2CLL bảng dữ liệu(HTML) 208 Page - Freescale Semiconductor, Inc |
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208 / 458 page  Chapter 10 Analog-to-Digital Converter (S08ADC12V1) MC9S08DZ128 Series Data Sheet, Rev. 1 208 Freescale Semiconductor 10.1.3 Alternate Clock The ADC module is capable of performing conversions using the MCU bus clock, the bus clock divided by two, the local asynchronous clock (ADACK) within the module, or the alternate clock, ALTCLK. The alternate clock for the MC9S08DZ128 Series MCU devices is the external reference clock (MCGERCLK). The selected clock source must run at a frequency such that the ADC conversion clock (ADCK) runs at a frequency within its specified range (fADCK) after being divided down from the ALTCLK input as determined by the ADIV bits. ALTCLK is active while the MCU is in wait mode provided the conditions described above are met. This allows ALTCLK to be used as the conversion clock source for the ADC while the MCU is in wait mode. ALTCLK cannot be used as the ADC conversion clock source while the MCU is in either stop2 or stop3. 10.1.4 Hardware Trigger The ADC hardware trigger, ADHWT, is the output from the real time counter (RTC) overflow or the external interrupt request (IRQ) pin. The source is selected by the ADC hardware trigger select bit, Table 10-1. ADC Channel Assignment Notes: 1 For information, see Section 10.1.5, “Temperature Sensor”. 2 Requires BGBE =1 in SPMSC1 see Section 5.8.7, “System Power Management Status and Control 1 Register (SPMSC1)”. For value of bandgap voltage reference see Section A.6, “DC Characteristics”. ADCH Channel Input 00000 AD0 PTA0/ADP0/MCLK 00001 AD1 PTA1/ADP1/ACMP1+ 00010 AD2 PTA2/ADP2/ACMP1P- 00011 AD3 PTA3/ADP3/ACMP1O 00100 AD4 PTA4/ADP4 00101 AD5 PTA5/ADP5 00110 AD6 PTA6/ADP6 00111 AD7 PTA7/ADP7 01000 AD8 PTB0/ADP8 01001 AD9 PTB1/ADP9 01010 AD10 PTB2/ADP10 01011 AD11 PTB3/ADP11 01100 AD12 PTB4/ADP12 01101 AD13 PTB5/ADP13 01110 AD14 PTB6/ADP14 01111 AD15 PTB7/ADP15 10000 AD16 PTC0/ADP16 10001 AD17 PTC1/ADP17 10010 AD18 PTC2/ADP18 10011 AD19 PTC3/ADP19 10100 AD20 PTC4/ADP20 10101 AD21 PTC5/ADP21 10110 AD22 PTC6/ADP22 10111 AD23 PTC7/ADP23 11000– AD24 through AD25 Reserved 11001 11010 AD26 Temperature Sensor1 11011 AD27 Internal Bandgap2 11100 VREFH VREFH 11101 VREFH VREFH 11110 VREFL VREFL 11111 Module Disabled None ADCH Channel Input |
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