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P87CL881H Datasheet(PDF) 7 Page - NXP Semiconductors |
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P87CL881H Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 32 page  1999 Apr 16 7 Philips Semiconductors Product specification Low-voltage microcontroller with 63-kbyte OTP program memory and 2-kbyte RAM P87CL881H P0.0/AD0 37 Port 0. 8-bit bidirectional I/O port with alternative functions. Every port pin can be used as open-drain, standard port, high-impedance input or push-pull output, according to Section 6.2. AD7 to AD0 provide the multiplexed low-order address and data bus during accesses to external memory. P0.1/AD1 36 P0.2/AD2 35 P0.3/AD3 34 P0.4/AD4 33 P0.5/AD5 32 P0.6/AD6 31 P0.7/AD7 30 P1.0/INT2/T2 40 Port 1. 8-bit bidirectional I/O port with alternative functions. Every port pin except P1.6 and P1.7 (I2C-bus pins) can be used as open-drain, standard port, high-impedance input or push-pull output, according to Section 6.2. Port 1 also serves the alternative functions INT2 to INT9 interrupts, Timer 2 external input and Timer 2 compare output, external clock output CLK and I2C-bus clock and I2C-bus data in/outputs. P1.1/INT3/T2EX 41 P1.2/INT4/ T2COMP 42 P1.3/INT5 43 P1.4/INT6/CLK 44 P1.5/INT7 1 P1.6/INT8/SCL 2 P1.7/INT9/SDA 3 P2.0/A8 18 Port 2. 8-bit bidirectional I/O port with alternative functions. Every port pin can be used as open-drain, standard port, high-impedance input or push-pull output, according to Section 6.2. Port 2 emits the high order address byte during accesses to external memory that use 16-bit addresses (MOVX @ DPTR). In this application it uses the strong internal pull-ups when emitting logic 1's. During accesses to external memory that use 8-bit addresses (MOVX @ Ri), Port 2 emits the contents of the P2 Special Function Register. P2.1/A9 19 P2.2/A10 20 P2.3/A11 21 P2.4/A12 22 P2.5/A13 23 P2.6/A14 24 P2.7/A15 25 P3.0/RXD/data 5 Port 3. 8-bit bidirectional I/O port with alternative functions. Every port pin can be used as open-drain, standard port, high-impedance input or push-pull output, according to Section 6.2. RXD/data is the serial port receiver data input (asynchronous) or data I/O (synchronous). TXD/clock is the serial port transmitter data output (asynchronous) or clock output (synchronous). INT0 and INT1 are external interrupt lines. T0 and T1 are external inputs for Timers 0 and 1 respectively. WR is the external memory write strobe and RD is the external memory read strobe. P3.1/TXD/clock 7 P3.2/INT0 8 P3.3/INT1 9 P3.4/T0 10 P3.5/T1 11 P3.6/WR 12 P3.7/RD 13 SYMBOL PIN DESCRIPTION |
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