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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TS87C51U2 데이터시트(PDF) 7 Page - ATMEL Corporation |
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TS87C51U2 데이터시트(HTML) 7 Page - ATMEL Corporation |
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7 / 67 page  Rev. D - 15 January, 2001 7 TS80C51U2 TS83C51U2 TS87C51U2 MNEMONIC PIN NUMBER TYPE NAME AND FUNCTION DIL LCC VQFP 1.4 Reset 9 10 4 I Reset: A high on this pin for two machine cycles while the oscillator is running, resets the device. An internal diffused resistor to VSS permits a power-on reset using only an external capacitor to VCC. If the hardware watchdog reaches its time-out, the reset pin becomes an output during the time the internal reset is activated. ALE/PROG 30 33 27 O (I) Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the address during an access to external memory. In normal operation, ALE is emitted at a constant rate of 1/6 (1/3 in X2 mode) the oscillator frequency, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. This pin is also the program pulse input (PROG) during EPROM programming. ALE can be disabled by setting SFR’s AUXR.0 bit. With this bit set, ALE will be inactive during internal fetches. PSEN 29 32 26 O Program Store ENable: The read strobe to external program memory. When executing code from the external program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. PSEN is not activated during fetches from internal program memory. EA/VPP 31 35 29 I External Access Enable/Programming Supply Voltage: EA must be externally held low to enable the device to fetch code from external program memory locations 0000H and 3FFFH (RB) or 7FFFH (RC), or FFFFH (RD). If EA is held high, the device executes from internal program memory unless the program counter contains an address greater than 3FFFH (RB) or 7FFFH (RC) EA must be held low for ROMless devices. This pin also receives the 12.75V programming supply voltage (VPP) during EPROM programming. If security level 1 is programmed, EA will be internally latched on Reset. XTAL1 19 21 15 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL2 18 20 14 O Crystal 2: Output from the inverting oscillator amplifier RxD_1 - 12 6 I Serial Input for UART_1. For 44-pin package only. TxD_1 - 34 28 O Serial Ouput for UART_1. This pin is pulled up by a 100K resistor when not selected. For 44-pin package only. Table 3. Pin Description for 40/44 pin packages |
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