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P89V51RD2FBC Datasheet(PDF) 9 Page - NXP Semiconductors |
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P89V51RD2FBC Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 80 page P89V51RB2_RC2_RD2_5 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 05 — 12 November 2009 9 of 80 NXP Semiconductors P89V51RB2/RC2/RD2 8-bit microcontrollers with 80C51 core [1] ALE loading issue: When ALE pin experiences higher loading (>30 pF) during the reset, the microcontroller may accidentally enter into modes other than normal working mode. The solution is to add a pull-up resistor of 3 k Ω to 50 kΩ to V DD, e.g., for ALE pin. [2] For 6-clock mode, ALE is emitted at 1 ⁄ 3 of crystal frequency. RST 9 4 10 I Reset: While the oscillator is running, a HIGH logic state on this pin for two machine cycles will reset the device. If the PSEN pin is driven by a HIGH-to-LOW input transition while the RST input pin is held HIGH, the device will enter the external host mode, otherwise the device will enter the normal operation mode. EA 31 29 35 I External Access Enable: EA must be connected to VSS in order to enable the device to fetch code from the external program memory. EA must be strapped to VDD for internal program execution. The EA pin can tolerate a high voltage of 12 V. ALE/PROG 30 27 33 I/O Address Latch Enable: ALE is the output signal for latching the low byte of the address during an access to external memory. This pin is also the programming pulse input (PROG) for flash programming. Normally the ALE[1] is emitted at a constant rate of 1 ⁄6 the crystal frequency[2] and can be used for external timing and clocking. One ALE pulse is skipped during each access to external data memory. However, if AO is set to ‘1’, ALE is disabled. n.c. - 6, 17, 28, 39 1, 12, 23, 34 I/O not connected XTAL1 19 15 21 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL2 18 14 20 O Crystal 2: Output from the inverting oscillator amplifier. VDD 40 38 44 I Power supply VSS 20 16 22 I Ground Table 3. P89V51RB2/RC2/RD2 pin description …continued Symbol Pin Type Description DIP40 TQFP44 PLCC44 |
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