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AN87C196LB 数据表(PDF) 12 Page - Intel Corporation |
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AN87C196LB 数据表(HTML) 12 Page - Intel Corporation |
12 / 19 page PRODUCT PREVIEW 12 AUTOMOTIVE ® T2CLK I Timer 2 External Clock External clock for timer 2. Timer 2 increments (or decrements) on both rising and falling edges of T2CLK. It is also used in conjunction with T2DIR for quadrature counting mode. T2CLK shares a package pin with P1.0 and EPA0. T2DIR I Timer 2 External Direction External direction (up/down) for timer 2. Timer 2 increments when T2DIR is high and decrements when it is low. It is also used in conjunction with T2CLK for quadrature counting mode. T2DIR shares a package pin with P1.2 and EPA2. TXJ1850 O Transmit This signal carries messages from the integrated J1850 module to an off-chip J1850 transceiver. TXJ1850 must not be driven high during reset and should only be used as an output. TXJ1850 shares a package pin with P2.6, ONCE#, and CPVER. TXD O Transmit Serial Data In serial I/O modes 1, 2, and 3, TXD transmits serial port output data. In mode 0, it is the serial clock output. TXD shares a package pin with P2.0 and PVER. V CC PWR Digital Supply Voltage Connect each V CC pin to the digital supply voltage. V PP PWR Programming Voltage V PP causes the device to exit powerdown mode when it is driven low for at least 50 ns. Use this method to exit powerdown only when using an external clock source because it enables the internal phase clocks, but not the internal oscillator. If you do not plan to use the powerdown feature, connect V PP to VCC. V REF PWR Reference Voltage for the A/D Converter This pin supplies operating voltage to the A/D converter. V SS, VSS 1 GND Digital Circuit Ground (Core Ground, Port Ground) These pins supply ground for the digital circuitry. Connect each V SS and VSS1 pin to ground through the lowest possible impedance path. V SS pins are con- nected to the core ground region of the microcontroller, while V SS1 pins are con- nected to the port ground region. (ANGND is connected to the analog ground region.) Separating the ground regions provides noise isolation. Table 4. Signal Descriptions (Continued) Name Type Description |
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类似说明 - AN87C196LB |
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