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80C152JC-1 Datasheet(PDF) 5 Page - Intel Corporation |
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80C152JC-1 Datasheet(HTML) 5 Page - Intel Corporation |
5 / 17 page 8XC152JAJBJCJD Pin Pin Description DIP PLCC(1) 48 2 VCC Supply voltage 24 333(2) VSS Circuit ground 18-21 27-30 Port 0 Port 0 is an 8-bit open drain bidirectional IO port As an output port each pin 25-28 34-37 can sink 8 LS TTL inputs Port 0 pins that have 1s written to them float and in that state can be used as high-impedance inputs Port 0 is also the multiplexed low-order address and data bus during accesses to external program memory if EBEN is pulled low During accesses to external Data Memory Port 0 always emits the low-order address byte and serves as the multiplexed data bus In these applications it uses strong internal pullups when emitting 1s Port 0 also outputs the code bytes during program verification External pullups are required during program verification 1-8 4-11 Port 1 Port 1 is an 8-bit bidirectional IO port with internal pullups Port 1 pins that have 1s written to them are pulled high by the internal pullups and in that state can be used as inputs As inputs Port 1 pins that are externally being pulled low will source current (IIL on the data sheet) because of the internal pullups Port 1 also serves the functions of various special features of the 8XC152 as listed below Pin Name Alternate Function P10 GRXD GSC data input pin P11 GTXD GSC data output pin P12 DEN GSC enable signal for an external driver P13 TXC GSC input pin for external transmit clock P14 RXC GSC input pin for external receive clock P15 HLD DMA hold inputoutput P16 HLDA DMA hold acknowledge inputoutput 29-36 41-48 Port 2 Port 2 is an 8-bit bidirectional IO port with internal pullups Port 2 pins that have 1s written to them are pulled high by the internal pullups and in that state can be used as inputs As inputs Port 2 pins that are externally being pulled low will source current (IIL on the data sheet) because of the internal pullups Port 2 emits the high-order address byte during fetches from external Program Memory if EBEN is pulled low During accesses to external Data Memory that use 16- bit addresses (MOVX DPTR and DMA operations) Port 2 emits the high-order address byte In these applications it uses strong internal pullups when emitting 1s During accesses to external Data Memory that use 8-bit addresses (MOVX Ri) Port 2 emits the contents of the P2 Special Function Register Port 2 also receives the high-order address bits during program verification 10- 17 14-16 Port 3 Port 3 is an 8-bit bidirectional IO port with internal pullups Port 3 pins that 18 19 have 1s written to them are pulled high by the internal pullups and in that state can be 23-25 used as inputs As inputs Port 3 pins that are externally being pulled low will source current (IIL on the data sheet) because of the pullups Port 3 also serves the functions of various special features of the MCS-51 Family as listed below Pin Name Alternate Function P30 RXD Serial input line P31 TXD Serial output line P32 INT0 External Interrupt 0 P33 INT1 External Interrupt 1 P34 T0 Timer 0 external input P35 T1 Timer 1 external input P36 WR External Data Memory Write strobe P37 RD External Data Memory Read strobe 5 |
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