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HC705RC17GRS/D Datasheet(PDF) 22 Page - NXP Semiconductors |
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HC705RC17GRS/D Datasheet(HTML) 22 Page - NXP Semiconductors |
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22 / 126 page  General Description General Release Specification MC68HC705RC17 — Rev. 2.0 General Description 1.5.6 IRO The IRO pin is the high-current source and sink output of the carrier modulator transmitter subsystem which is suitable for driving infrared (IR) LED biasing logic. See Section 9. Carrier Modulator Transmitter (CMT). 1.5.7 Port A (PA0–PA7) These eight I/O lines comprise port A. The state of any pin is software programmable and all port A lines are configured as inputs during power-on or reset. For detailed information on I/O programming, see Section 7. Parallel Input/Output (I/O). 1.5.8 Port B (PB0–PB7) These eight I/O lines comprise port B. The state of any pin is software programmable and all port B lines are configured as inputs during power-on or reset. Each port B I/O line has a mask optionable pullup for keyscan. For detailed information on I/O programming, see Section 7. Parallel Input/Output (I/O). 1.5.9 Port C (PC0–PC1 and PC4–PC7) These six I/O lines comprise port C. PC0 is a high-current pin. PC4 through PC7 are available only in higher pin count (>28) packages. The state of any pin is software programmable and all port C lines are configured as input during power-on or reset. For detailed information on I/O programming, see Section 7. Parallel Input/Output (I/O). NOTE: Only two bits of port C are bonded out in 28-pin packages for the MC68HC705RC17, although port C is truly a 6-bit port. Since pins PC4–PC7 are unbonded, software should include the code to set their respective data direction register locations to outputs to avoid floating inputs. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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