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C161 Datasheet(PDF) 161 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 161 Page - Infineon Technologies AG |
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161 / 400 page  &3, 'HGLFDWHG 3LQV User’s Manual 8-1 1999-08 8 Dedicated Pins Most of the input/output or control signals of the functional the C161PI are realized as alternate functions of pins of the parallel ports. There is, however, a number of signals that use separate pins, including the oscillator, special control signals and, of course, the power supply. The table below summarizes the 24 dedicated pins of the C161PI. The Address Latch Enable signal ALE controls external address latches that provide a stable address in multiplexed bus modes. ALE is activated for every external bus cycle independent of the selected bus mode, i.e. it is also activated for bus cycles with a demultiplexed address bus. When an external bus is enabled (one or more of the BUSACT bits set) also X-Peripheral accesses will generate an active ALE signal. ALE is not activated for internal accesses, i.e. accesses to ROM/OTP/Flash (if provided), the internal RAM and the special function registers. In single chip mode, i.e. when no external bus is enabled (no BUSACT bit set), ALE will also remain inactive for X- Peripheral accesses. During reset an internal pulldown ensures an inactive (low) level on the ALE output. Table 8-1 C161PI Dedicated Pins Pin(s) Function ALE Address Latch Enable RD External Read Strobe WR/WRL External Write/Write Low Strobe READY Ready Input EA External Access Enable NMI Non-Maskable Interrupt Input XTAL1, XTAL2 Oscillator Input / Output RSTIN Reset Input RSTOUT Reset Output VAREF, VAGND Power Supply for Analog/Digital Converter VDD, VSS Digital Power Supply and Ground (6 pins each) |
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