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C161 Datasheet(PDF) 128 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 128 Page - Infineon Technologies AG |
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128 / 400 page  &3, 3DUDOOHO 3RUWV User’s Manual 7-2 1999-08 A write operation to a port pin configured as an input causes the value to be written into the port output latch, while a read operation returns the latched state of the pin itself. A read-modify-write operation reads the value of the pin, modifies it, and writes it back to the output latch. Writing to a pin configured as an output (DPx.y=‘1’) causes the output latch and the pin to have the written value, since the output buffer is enabled. Reading this pin returns the value of the output latch. A read-modify-write operation reads the value of the output latch, modifies it, and writes it back to the output latch, thus also modifying the level at the pin. 7.1 Input Threshold Control The standard inputs of the C161PI determine the status of input signals according to TTL levels. In order to accept and recognize noisy signals, CMOS-like input thresholds can be selected instead of the standard TTL thresholds for all pins of specific ports. These special thresholds are defined above the TTL thresholds and feature a defined hysteresis to prevent the inputs from toggling while the respective input signal level is near the thresholds. The Port Input Control register PICON allows to select these thresholds for each byte of the indicated ports, i.e. 8-bit ports are controlled by one bit each while 16-bit ports are controlled by two bits each. PICON Port Input Control Register ESFR (F1C4 H/E2H) Reset value: - - 00 H 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -- - P4L IN P3H IN P3L IN -- - - - - - - - - - - - rw rw rw - - Bit Function PxLIN Port x Low Byte Input Level Selection 0: Pins Px[7-0] switch on standard TTL input levels 1: Pins Px[7-0] switch on special threshold input levels PxHIN Port x High Byte Input Level Selection 0: Pins Px[15-8] switch on standard TTL input levels 1: Pins Px[15-8] switch on special threshold input levels |
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