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DS87C550-FNL Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS87C550-FNL Datasheet(HTML) 5 Page - Dallas Semiconductor |
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5 / 50 page  DS87C550 5 of 50 PLCC/ CLCC QFP SIGNAL NAME DESCRIPTION 50-57 57 56 55 54 53 52 51 50 51-58 58 57 56 55 54 53 52 51 P0.0 (AD0) P0.1 (AD1) P0.2 (AD2) P0.3 (AD3) P0.4 (AD4) P0.5 (AD5) P0.6 (AD6) P0.7 (AD7) Port 0-I/O - AD0-7. Port 0 is an open-drain 8-bit, bi-directional general-purpose I/O port. When used in this mode pullup resistors are required to provide a logic 1 output. As an alternate function, Port 0 operates as a multiplexed address/data bus to access off-chip memory or peripherals. In this mode, the LSB of the memory address is output on the bus during the time that ALE is high. When ALE falls to a logic 0, the port transitions to a bi-directional data bus. In this mode, the port provides active high drivers for logic 1 output. The reset condition of Port 0 is tri- state (i.e., the open drain devices are off). 39-46 39 40 41 42 43 44 45 46 38-42 45-47 38 39 40 41 42 45 46 47 P2.0 (A8) P2.1 (A9) P2.2 (A10) P2.3 (A11) P2.4 (A12) P2.5 (A13) P2.6 (A14) P2.7 (A15) Port 2-I/O Address A15:A8. Port 2 functions as an 8-bit bi-directional I/O port or alternately as an external address bus (A15-A8). The reset condition of Port 2 is logic high I/O state. In this state, weak pullups hold the port high allowing the pins to be used as an input or output as described above for Port 1. As an alternate function Port 2 can function as MSB of the external address bus. This bus can be used to read external memory or peripherals. 24-31 18-20 23-27 P3.0-P3.7 Port 3 - I/O. Port 3 functions as an 8-bit bi-directional I/O port or alternately as an interface for External Interrupts, Serial Port 0, Timer 0 & 1 Inputs, and RD and WR strobes. When functioning as an I/O port, these pins operate as indicated above for Port 1. The alternate modes of Port 3 are detailed below. Port Alternate Mode 24 18 P3.0 RXD0 Serial Port 0 Input 25 19 P3.1 TXD0 Serial Port 0 Output 26 20 P3.2 INT0 External Interrupt 0 27 23 P3.3 INT1 External Interrupt 1 28 24 P3.4 T0 Timer 0 External Input 29 25 P3.5 T1 Timer 1 External Input 30 26 P3.6 WR External Data Memory Write Strobe 31 27 P3.7 RD External Data Memory Read Strobe 7-14 80 1-2 4-8 P4.0-P4.7 Port 4 - I/O. Port 4 functions as an 8-bit bi-directional I/O port or alternately as an interface to Timer 2’s Capture Compare functions. When functioning as an I/O port, these pins operate as indicated in the Port 1 description. The alternate modes of Port 4 are detailed below. Port 4 Alternate Mode 7 80 P4.0 CMSR0 Timer 2 compare match set/reset output 0 8 1 P4.1 CMSR1 Timer 2 compare match set/reset output 1 9 2 P4.2 CMSR2 Timer 2 compare match set/reset output 2 10 4 P4.3 CMSR3 Timer 2 compare match set/reset output 3 11 5 P4.4 CMSR4 Timer 2 compare match set/reset output 4 12 6 P4.5 CMSR5 Timer 2 compare match set/reset output 5 13 7 P4.6 CMT0 Timer 2 compare match toggle output 0 14 8 P4.7 CMT1 Timer 2 compare match toggle output 1 |
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Similar Description - DS87C550-FNL |
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