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PC912XDP512F0CALR Datasheet(PDF) 167 Page - Freescale Semiconductor, Inc |
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PC912XDP512F0CALR Datasheet(HTML) 167 Page - Freescale Semiconductor, Inc |
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167 / 1348 page  Chapter 5 Analog-to-Digital Converter (S12ATD10B8CV2) MC9S12XDP512 Data Sheet, Rev. 2.21 Freescale Semiconductor 167 5.3.2.2 ATD Control Register 1 (ATDCTL1) Writes to this register will abort current conversion sequence but will not start a new sequence. Read: Anytime Write: Anytime 76543210 R ETRIGSEL 0000 ETRIGCH2 ETRIGCH1 ETRIGCH0 W Reset 00000111 = Unimplemented or Reserved Figure 5-4. ATD Control Register 1 (ATDCTL1) Table 5-3. ATDCTL1 Field Descriptions Field Description 7 ETRIGSEL External Trigger Source Select — This bit selects the external trigger source to be either one of the AD channels or one of the ETRIG3–0 inputs. See the device overview chapter for availability and connectivity of ETRIG3–0 inputs. If ETRIG3–0 input option is not available, writing a 1 to ETRISEL only sets the bit but has not effect, that means still one of the AD channels (selected by ETRIGCH2–0) is the source for external trigger. The coding is summarized in Table 5-4. 2–0 ETRIGCH[2:0] External Trigger Channel Select — These bits select one of the AD channels or one of the ETRIG3–0 inputs as source for the external trigger. The coding is summarized in Table 5-4. Table 5-4. External Trigger Channel Select Coding ETRIGSEL ETRIGCH2 ETRIGCH1 ETRIGCH0 External trigger source is 0 0 0 0 AN0 0 0 0 1 AN1 0 0 1 0 AN2 0 0 1 1 AN3 0 1 0 0 AN4 0 1 0 1 AN5 0 1 1 0 AN6 0 1 1 1 AN7 1 0 0 0 ETRIG01 1 Only if ETRIG3–0 input option is available (see device overview chapter), else ETRISEL is ignored, that means external trigger source is still on one of the AD channels selected by ETRIGCH2–0 1 0 0 1 ETRIG11 1 0 1 0 ETRIG21 1 0 1 1 ETRIG31 1 1 X X Reserved |
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