поискавой системы для электроныых деталей |
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CDP1851C датащи(PDF) 8 Page - Intersil Corporation |
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CDP1851C датащи(HTML) 8 Page - Intersil Corporation |
8 / 14 page 4-12 Function Pin Definition CLOCK (Input): Positive input pulse that latches READ and CS on its trailing edge. CS - CHIP SELECT (Input) A high-level voltage at this input selects the CDP1851 PlO. RA0 - REGISTER ADDRESS 0 (Input): This input and RA1 are used to select either the ports or the control/status registers. RA1 - REGISTER ADDRESS 1(Input): See RAO BUS 0 - BUS 7: Bidirectional CPU data bus. CLEAR (Input) A low-level voltage at this input resets both ports to the input mode, and also resets the status register, A RDY, B RDY, and interrupt enable (disabling interrupts). A INT - A INTERRUPT (Output): A low-level voltage at this output indicates the presence of one of the interrupt conditions listed in Table 3. This output is an open-drain NMOS device (to allow wired O Ring) and must be tied to a pullup resistor, normally 10k Ω. B INT - B INTERRUPT (Output): A low-level voltage at this output indicates the presence of one of the interrupt conditions listed in Table 3. This output is also an open-drain NMOS device and must be tied to a pullup resistor. B RDY - B READY (Output): This output is a handshaking or data bit I/O line in the bit- programmable mode. B STROBE (Input): An input handshaking line for port B in the input and output modes, and for port A when it is in the bidirectional mode. It can be used as a data bit I/O line in the bit-programmable mode except when port A is not programmed as bidirectional. B0 - B7: Data input or output lines for port B. VSS Ground A0 - A7: Data input or output lines for port A. A STROBE (Input): An input handshaking line for port A in the input, output, and bidirectional modes. It can also be used as a data bit I/O line when port A is in the bit-programmable mode. ARDY - AREADY (Output): A output handshaking line or data bit I/O line. TPB (Input): A positive input pulse used as a data load, set, or reset strobe. WR/RE - WRITE/READ ENABLE (Input): A positive input used to write data from the CDP1851 to the CPU bus. RD/WE - READ/WRITE ENABLE (Input): A positive input used to read data from the CPU bus to the CDP1851 bus. VDD: Positive supply voltage. CDP1851, CDP1851C |
Аналогичный номер детали - CDP1851C |
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Аналогичное описание - CDP1851C |
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