поискавой системы для электроныых деталей |
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8XC251SA датащи(PDF) 9 Page - Intel Corporation |
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8XC251SA датащи(HTML) 9 Page - Intel Corporation |
9 / 18 page 5 8xC251Tx Hardware Description VCC2 PWR Secondary Supply Voltage 2. This supply voltage connection is pro- vided to reduce power supply noise. Connection of this spin to the +5V supply voltage is recommended. However, when using the ZX3 as a pin for pin replacement for the 8XC51FX, VCC2 can be uncon- nected without loss of compatibility (Not available on DIP). VSS GND Circuit Ground. Connect this pin to ground. VSS1 GND Secondary Ground. This ground is provided to reduce ground bounce and improve power supply bypassing. Connection of this pin to ground is recommended. However, when using the ZX3 as a pin for pin replacement for the 8XC51FX, VSS1 can be unconnected with- out loss of compatibility. (Not available in DIP). VSS2 GND Secondary Ground 2. This ground is provided to reduce ground bounce and improve power supply bypassing. Connection of this pin to ground is recommended. However, when using the ZX3 as a pin for pin replacement for the 8XC51FX, VSS1 can be unconnected with- out loss of compatibility. (Not available in DIP). WAIT# I Real-time Wait State Input. The real-time WAIT# input is enabled by writing a logical "1" to the WCON.0 (RTWE) bit at S:A7H. During bus cycles, the external memory system can signal ‘system ready’ to the microprocessor in real time by controlling the WAIT# input signal P1.6/CEX3 WCLK O Wait Clock Output. The real-time Wait Clock output is driven by writ- ing a logical "1" to the WCON.1 (RTWCE) bit at S:A7H. When enabled, the WCLK output produces a square wave signal with a period of one-half the oscillator frequency P1.7/CEX4/ A17 WR# O Write. Write signal output to external memory. Asserted for the mem- ory address range specified by configuration byte UCONFIG0, bits RD1:0. P3.6 XTAL1 I Input to On-chip, Inverting Oscillator Amplifier. To use the inter- nal oscillator, a crystal/resonator circuit is connected to this pin. If an external oscillator is used, its output is connected to this pin. XTAL1 is the clock source for the internal timing XTAL2 O Output of the On-chip, Inverting Oscillator Amplifier. To use the internal oscillator, a crystal/resonator circuit is connected to this pin. If an external oscillator is used, leave XTAL2 unconnected. Table 2. 8xC251Tx Signal Descriptions (Sheet 3 of 3) Signal Name Type Description Alternate Function * The descriptions of A15:8/P2.7:0 and AD7:0/P0.7:0 are for non page mode configuration. If configured in page mode, Port 0 carries the lower address bits (A7:0) and Port 2 carries the upper address bits (A15:8) and the data (D7:0) |
Аналогичный номер детали - 8XC251SA |
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Аналогичное описание - 8XC251SA |
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