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P87C51RB2BBD Folha de dados(PDF) 51 Page - NXP Semiconductors |
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P87C51RB2BBD Folha de dados(HTML) 51 Page - NXP Semiconductors |
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51 / 67 page ![]() Philips Semiconductors Product data P87C51RA2/RB2/RC2/RD2 80C51 8-bit microcontroller family 8KB/16KB/32KB/64KB OTP with 512B/1KB RAM, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz) 2003 Jan 24 51 tLLAX ALE PSEN PORT 0 PORT 2 WR A0–A7 FROM RI OR DPL DATA OUT A0–A7 FROM PCL INSTR IN P2.0–P2.7 OR A8–A15 FROM DPF A0–A15 FROM PCH tWHLH tLLWL tWLWH tAVLL tAVWL tQVWX tWHQX tQVWH SU00026 Figure 36. External Data Memory Write Cycle 0 1 2 3 4 5 678 INSTRUCTION ALE CLOCK OUTPUT DATA WRITE TO SBUF INPUT DATA CLEAR RI SET TI SET RI tXLXL tQVXH tXHQX tXHDX tXHDV SU00027 12 3 0 456 7 VALID VALID VALID VALID VALID VALID VALID VALID Figure 37. Shift Register Mode Timing VCC–0.5 0.45V 0.7VCC 0.2VCC–0.1 tCHCL tCLCL tCLCH tCLCX tCHCX SU00009 Figure 38. External Clock Drive |
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