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MC908QC4CDZER Datasheet(PDF) 24 Page - Freescale Semiconductor, Inc |
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MC908QC4CDZER Datasheet(HTML) 24 Page - Freescale Semiconductor, Inc |
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24 / 274 page  General Description MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 2 24 Freescale Semiconductor 1.6 Pin Function Priority Table 1-3 is meant to resolve the priority if multiple functions are enabled on a single pin. NOTE Upon reset all pins come up as input ports regardless of the priority table. 1.7 Unused Pin Termination Input pins and I/O port pins that are not used in the application must be terminated. This prevents excess current caused by floating inputs, and enhances immunity during noise or transient events. Termination methods include: 1. Configuring unused pins as outputs and driving high or low; 2. Configuring unused pins as inputs and enabling internal pull-ups; 3. Configuring unused pins as inputs and using external pull-up or pull-down resistors. Never connect unused pins directly to VDD or VSS. Since some general-purpose I/O pins are not available on all packages, these pins must be terminated as well. Either method 1 or 2 above are appropriate. Table 1-3. Function Priority in Shared Pins Pin Name Highest-to-Lowest Priority Sequence PTA0(1) 1. When a pin is to be used as an ADC pin, the I/O port function should be left as an input and all other shared modules should be disabled. The ADC does not override additional modules using the pin. AD0 → T1CH0 → KBI0 → PTA0 PTA1(1) AD1 → T1CH1 → KBI1 → PTA1 PTA2 IRQ → T1CLK → KBI2 → PTA2 PTA3 RST → KBI3 → PTA3 PTA4(1) OSC2 → AD2 → KBI4 → PTA4 PTA5(1) OSC1 → AD3 → KBI5 → PTA5 PTB0(1) AD4 → SPSCK → PTB0 PTB1(1) AD5 → MOSI → T2CH1(2) → PTB1 2. T2CH0 and T2CH1 can be repositioned using TIM2POS in CONFIG2 (see Figure 2-2. Control, Status, and Data Registers). PTB2(1) AD6 → MISO → T2CH0(2) → PTB2 PTB3(1) AD7 → SS → T2CLK → PTB3 PTB4(1) AD8 → RxD → T2CH0(2) → PTB4 PTB5(1) AD9 → TxD → T2CH1(2) → PTB5 PTB6 T1CH2 → PTB6 PTB7 T1CH3 → PTB7 PTCx PTCx PTDx PTDx |
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