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P83C661X2FA Datasheet(PDF) 7 Page - NXP Semiconductors |
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P83C661X2FA Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 102 page  Philips Semiconductors Product data P8xC660X2/661X2 80C51 8-bit microcontroller family 16 KB OTP/ROM, 512B RAM, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz), two 400KB I2C interfaces 2003 Oct 02 7 PIN DESCRIPTIONS MNEMONIC PIN NUMBER TYPE NAME AND FUNCTION MNEMONIC PLCC LQFP TYPE NAME AND FUNCTION VSS1 22 16 I Ground: 0 V reference. VSS2 34 28 I Ground: Additional ground pin (may be left open). VSS3 12 6 I Ground: Additional ground pin (may be left open). VCC 44 38 I Power Supply: This is the power supply voltage for normal, idle, and power-down operation. P0.0–0.72 43–36 37–30 I/O Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to them float and can be used as high-impedance inputs. Port 0 is also the multiplexed low-order address and data bus during accesses to external program and data memory. In this application, it uses strong internal pull-ups when emitting 1s. P1.0–P1.72 2–9 40–44, 1–3 I/O Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups on all pins. Port 1 pins that have 1s written to them are pulled HIGH by the internal pull-ups and can be used as inputs. As inputs, port 1 pins that are externally pulled LOW will source current because of the internal pull-ups. (See DC Electrical Characteristics: IIL). Alternate functions for P8xC660X2/661X2 Port 1 include: 2 40 I/O T2 (P1.0): Timer/Counter 2 external count input/Clockout (see Programmable Clock-Out) 3 41 I T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control 4 42 I ECI (P1.2): External Clock Input to the PCA 5 43 I/O CEX0 (P1.3): Capture/Compare External I/O for PCA module 0 6 44 I/O CEX1 (P1.4): Capture/Compare External I/O for PCA module 1 7 1 I/O CEX2 (P1.5): Capture/Compare External I/O for PCA module 2 8 2 I/O SCL (P1.6): I2C bus clock line (open drain) 9 3 I/O SCL (P1.7): I2C bus data line (open drain) P2.0–P2.72 24–31 18–25 I/O Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s written to them are pulled HIGH by the internal pull-ups and can be used as inputs. As inputs, port 2 pins that are externally being pulled LOW will source current because of the internal pull-ups. (See DC Electrical Characteristics: IIL). Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses (MOVX @DPTR). In this application, it uses strong internal pull-ups when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOV @Ri), port 2 emits the contents of the P2 special function register. P3.0–P3.72 11, 13–19 5, 7–13 I/O Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s written to them are pulled HIGH by the internal pull-ups and can be used as inputs. As inputs, port 3 pins that are externally being pulled LOW will source current because of the pull-ups. (See DC Electrical Characteristics: IIL). Port 3 also serves the special features of the P8xC660X2/661X2, as listed below: 11 5 I RxD (P3.0): Serial input port 13 7 O TxD (P3.1): Serial output port 14 8 I INT0 (P3.2): External interrupt 0 15 9 I INT1 (P3.3): External interrupt 1 16 10 I CEX3/T0 (P3.4): Timer 0 external input; capture/compare external I/O for PCA module 3 17 11 I CEX4/T1 (P3.5): Timer 1 external input; capture/compare external I/O for PCA module 4 18 12 O WR (P3.6): External data memory write strobe 19 13 O RD (P3.7): External data memory read strobe RST2 10 4 I Reset: A HIGH on this pin for two machine cycles while the oscillator is running, resets the device. An internal resistor to VSS permits a power-on reset using only an external capacitor to VCC. SCL1 23 17 I/O Second I2C bus clock line (open drain) (P8xC661X2) SDA1 1 39 I/O Second I2C bus data line (open drain) (P8xC661X2) |
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