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S9S08SG16E1JTLR Datasheet(PDF) 83 Page - Freescale Semiconductor, Inc |
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S9S08SG16E1JTLR Datasheet(HTML) 83 Page - Freescale Semiconductor, Inc |
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83 / 328 page  Chapter 6 Parallel Input/Output Control MC9S08SG32 Data Sheet, Rev. 7 Freescale Semiconductor 83 6.6.1.5 Port A Drive Strength Selection Register (PTADS) 6.6.1.6 Port A Interrupt Status and Control Register (PTASC) 76543210 R PTADS7 PTADS6 R R PTADS3 PTADS2 PTADS1 PTADS0 W Reset: 00000000 Figure 6-7. Drive Strength Selection for Port A Register (PTADS) Table 6-6. PTADS Register Field Descriptions Field Description 7:5,3:0 PTADS[7:5, 3:0] Output Drive Strength Selection for Port A Bits — Each of these control bits selects between low and high output drive for the associated PTA pin. For port A pins that are configured as inputs, these bits have no effect. 0 Low output drive strength selected for port A bit n. 1 High output drive strength selected for port A bit n. 5:4 Reserved Reserved Bits — These bits are unused on this MCU, writes have no affect and could read as 1s or 0s. 76543210 R 0000 PTAIF 0 PTAIE PTAMOD W PTAACK Reset: 00000000 Figure 6-8. Port A Interrupt Status and Control Register (PTASC) Table 6-7. PTASC Register Field Descriptions Field Description 3 PTAIF Port A Interrupt Flag — PTAIF indicates when a port A interrupt is detected. Writes have no effect on PTAIF. 0 No port A interrupt detected. 1 Port A interrupt detected. 2 PTAACK Port A Interrupt Acknowledge — Writing a 1 to PTAACK is part of the flag clearing mechanism. PTAACK always reads as 0. 1 PTAIE Port A Interrupt Enable — PTAIE determines whether a port A interrupt is enabled. 0 Port A interrupt request not enabled. 1 Port A interrupt request enabled. 0 PTAMOD Port A Detection Mode — PTAMOD (along with the PTAES bits) controls the detection mode of the port A interrupt pins. 0 Port A pins detect edges only. 1 Port A pins detect both edges and levels. |
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