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P80C32 Datasheet(PDF) 10 Page - NXP Semiconductors |
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P80C32 Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 62 page  Philips Semiconductors Product data P80C3xX2; P80C5xX2; P87C5xX2 80C51 8-bit microcontroller family 4K/8K/16K/32K ROM/OTP, low voltage (2.7 to 5.5 V), low power, high speed (30/33 MHz) 2003 Jan 24 10 PIN DESCRIPTIONS PIN NUMBER MNEMONIC DIP PLCC LQFP TSSOP TYPE NAME AND FUNCTION VSS 20 22 16 9 I Ground: 0 V reference. VCC 40 44 38 29 I Power Supply: This is the power supply voltage for normal, idle, and power-down operation. P0.0-0.7 39–32 43–36 37–30 28–21 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. Port 0 also outputs the code bytes during program verification and received code bytes during EPROM programming. External pull-ups are required during program verification. P1.0–P1.7 1–8 2–9 40–44, 1–3 30–37 I/O Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. 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). Port 1 also receives the low-order address byte during program memory verification. Alternate functions for Port 1 include: 1 2 40 30 I/O T2 (P1.0): Timer/Counter 2 external count input/clockout (see Programmable Clock-Out) 2 3 41 31 I T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction control P2.0–P2.7 21–28 24–31 18–25 10–17 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. Some Port 2 pins receive the high order address bits during EPROM programming and verification. P3.0–P3.7 10–17 11, 13–19 5, 7–13 1–6 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 80C51 family, as listed below: 10 11 5 1 I RxD (P3.0): Serial input port 11 13 7 2 O TxD (P3.1): Serial output port 12 14 8 I INT0 (P3.2): External interrupt1 13 15 9 3 I INT1 (P3.3): External interrupt 14 16 10 4 I T0 (P3.4): Timer 0 external input 15 17 11 I T1 (P3.5): Timer 1 external input1 16 18 12 5 O WR (P3.6): External data memory write strobe 17 19 13 6 O RD (P3.7): External data memory read strobe RST 9 10 4 38 I Reset: A high on this pin for two machine cycles while the oscillator is running, resets the device. An internal diffused resistor to VSS permits a power-on reset using only an external capacitor to VCC. ALE/PROG 30 33 27 19 O Address Latch Enable/Program Pulse: Output pulse for latching the low byte of the address during an access to external memory. In normal operation, ALE is emitted at a constant rate of 1/6 (12-clock Mode) or 1/3 (6-clock Mode) the oscillator frequency, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. This pin is also the program pulse input (PROG) during EPROM programming. ALE can be disabled by setting SFR auxiliary.0. With this bit set, ALE will be active only during a MOVX instruction. |
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