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P89V51RC2 Datasheet(PDF) 7 Page - NXP Semiconductors |
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P89V51RC2 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 77 page Philips Semiconductors P89V51RB2/RC2/RD2 8-bit microcontrollers with 80C51 core Product data Rev. 03 — 02 December 2004 7 of 77 9397 750 14341 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. 5.2 Pin description Table 3: P89V51RB2/RC2/RD2 pin description Symbol Pin Type Description DIP40 TQFP44 PLCC44 P0.0 to P0.7 39-32 37-30 43-36 I/O Port 0: Port 0 is an 8-bit open drain bi-directional I/O port. Port 0 pins that have ‘1’s written to them float, and in this state can be used as high-impedance inputs. Port 0 is also the multiplexed low-order address and data bus during accesses to external code and data memory. In this application, it uses strong internal pull-ups when transitioning to ‘1’s. Port 0 also receives the code bytes during the external host mode programming, and outputs the code bytes during the external host mode verification. External pull-ups are required during program verification or as a general purpose I/O port. P1.0 to P1.7 1-8 40-44, 1-3 2-9 I/O with internal pull-up Port 1: Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 1 pins are pulled high by the internal pull-ups when ‘1’s are written to them and can be used as inputs in this state. As inputs, Port 1 pins that are externally pulled LOW will source current (IIL) because of the internal pull-ups. P1.5, P1.6, P1.7 have high current drive of 16 mA. Port 1 also receives the low-order address bytes during the external host mode programming and verification. P1.0 1 40 2 I/O T2: External count input to Timer/Counter 2 or Clock-out from Timer/Counter 2 P1.1 2 41 3 I T2EX: Timer/Counter 2 capture/reload trigger and direction control P1.2 3 42 4 I ECI: External clock input. This signal is the external clock input for the PCA. P1.3 4 43 5 I/O CEX0: Capture/compare external I/O for PCA Module 0. Each capture/compare module connects to a Port 1 pin for external I/O. When not used by the PCA, this pin can handle standard I/O. P1.4 5 44 6 I/O SS: Slave port select input for SPI CEX1: Capture/compare external I/O for PCA Module 1 P1.5 6 1 7 I/O MOSI: Master Output Slave Input for SPI CEX2: Capture/compare external I/O for PCA Module 2 P1.6 7 2 8 I/O MISO: Master Input Slave Output for SPI CEX3: Capture/compare external I/O for PCA Module 3 P1.7 8 3 9 I/O SCK: Master Output Slave Input for SPI CEX4: Capture/compare external I/O for PCA Module 4 |
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