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C161 Datasheet(PDF) 108 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 108 Page - Infineon Technologies AG |
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108 / 400 page  &3, ,QWHUUXSW DQG 7UDS )XQFWLRQV User’s Manual 5-26 1999-08 Fast External Interrupts The input pins that may be used for external interrupts are sampled every 16 TCL, i.e. external events are scanned and detected in timeframes of 16 TCL. The C161PI provides 8 interrupt inputs that are sampled every 2 TCL, so external events are captured faster than with standard interrupt inputs. The 8 pins of Port 2 (P2.15-P2.8) can individually be programmed to this fast interrupt mode, where also the trigger transition (rising, falling or both) can be selected. The External Interrupt Control register EXICON controls this feature for all 8 pins. Note: The fast external interrupt inputs are sampled every 2 TCL. The interrupt request arbitration and processing, however, is executed every 8 TCL. The interrupt control registers listed below (CC15IC...CC8IC) control the fast external interrupts of the C161PI. These fast external interrupt nodes and vectors are named according to the C167’s CAPCOM channels CC15...CC8, so interrupt nodes receive equal names throughout the architecture. See register description below. EXICON External Intr. Ctrl. Reg. ESFR (F1C0 H/E0H) Reset value: 0000 H 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 EXI7ES EXI6ES EXI5ES EXI4ES EXI3ES EXI2ES EXI1ES EXI0ES rw rw rw rw rw rw rw rw Bit Function EXIxES External Interrupt x Edge Selection Field (x=7...0) 0 0: Fast external interrupts disabled: standard mode 0 1: Interrupt on positive edge (rising) 1 0: Interrupt on negative edge (falling) 1 1: Interrupt on any edge (rising or falling) |
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