Datenblatt-Suchmaschine für elektronische Bauteile |
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TSC80251G1D-16IA Datenblatt(PDF) 7 Page - TEMIC Semiconductors |
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TSC80251G1D-16IA Datenblatt(HTML) 7 Page - TEMIC Semiconductors |
7 / 52 page TSC87251G1A 7 Rev. A – September 21, 1998 Alternate Function Description Type Signal Name T2 I/O Timer 2 Clock Input/Output For the timer 2 capture mode, T2 is the external clock input. For the Timer 2 clock–out mode, T2 is the clock output. P1.0 T2EX I Timer 2 External Input In timer 2 capture mode, a falling edge initiates a capture of the timer 2 registers. In auto–reload mode, a falling edge causes the timer 2 register to be reloaded. In the up–down counter mode, this signal determines the count direction: 1= up, 0= down. P1.1 TXD I/O Transmit Serial Data TXD outputs the shift clock in serial I/O mode 0 and transmits data in serial I/O modes 1, 2 and 3. P3.1 VDD PWR Digital Supply Voltage Connect this pin to +5V or +3V supply voltage. VSS GND Circuit Ground Connect this pin to ground. VSS1 GND Secondary Ground 1 This ground is provided to reduce ground bounce and improve power supply bypassing. Con- nection of this pin to ground is recommended. However, when using the TSC87251G1A as a pin–for–pin replacement for a 8xC51 product, VSS1 can be unconnected without loss of com- patibility. Not available on DIP package. VSS2 GND Secondary Ground 2 This ground is provided to reduce ground bounce and improve power supply bypassing. Con- nection of this pin to ground is recommended. However, when using the TSC87251G1A as a pin–for–pin replacement for a 8xC51 product, VSS2 can be unconnected without loss of com- patibility. Not available on DIP package. VPP I Programming Supply Voltage The programming supply voltage is applied to this input for programming the on–chip EPROM/ OTPROM WR# O Write Write signal output to external memory. P3.6 XTAL1 I Input to 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, its output is connected to this pin. XTAL1 is the clock source for internal tim- ing. 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. Note: 1. The description of A15:8/P2.7:0 and AD7:0/P0.7:0 are for the non–page mode chip configuration. If the chip is configured in page mode operation, port 0 carries the lower address bits (A7:0) while port 2 carries the upper address bits (A15:8) and the data (D7:0). |
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