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UPD72012CU-XXX Datasheet(PDF) 10 Page - NEC |
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UPD72012CU-XXX Datasheet(HTML) 10 Page - NEC |
10 / 36 page 10 Data Sheet S13918EJ3V0DS µPD72012 1.2 Tables by Pin Function Table 1-1. Oscillator Circuit Switching Control (CLKSEL) CLKSEL Type of oscillator circuit L Input clocks from 48 MHz oscillator H Clock input using 4 MHz crystal resonator (drive circuit is incorporated) Remark Directly connect to VDD when using CLKSEL=“H”. Even 5 V is no trouble. Table 1-2. Power Mode/Downstream Port Number Control (PSSEL, PVSEL) PSSEL PVSEL Power mode Port #1 Port #2 Port #3 Port #4 Port #5 L L Self-power Note 1 × L H Self-power Note 1 H L Bus power Note 2 × H H Prohibited Note 3 –– – – – Notes 1. Do not cut-off clock input when using self-power. If it is cut-off, internal functions stop and operation may not be possible even if clocks are input again. 2. When using bus power, up to four ports can be used. 3. The combination PSSEL=“H”, PVSEL=“H” is prohibited. Operation in this case is not guaranteed. Remark Also set according to this table when setting the number of ports in a Mask ROM code product to up to 5 ports. Directly connect data lines of unused ports to GND. Table 1-3. Handling of Pins CS1 to CS5 According to Setting of wHubCharacteristics Field of HUB Class Descriptor wHubCharacteristics Bits 4, 3 CS1 CS2 CS3 CS4 CS5 0b00 Common in all ports 0b01 Port #1 Port #2 Port #3 Port #4 Port #5 0b10 or 0b11 Not available Not available Not available Not available Not available Remark Connect pins CS1 to CS5 to the Over Current Detect output pin of the power switch IC. Clamp an unused or unavailable CS1 to CS5 pin to 3.3 V. Table 1-4. Handling of Pins PP1 to PP5 According to Setting of wHubCharacteristics Field of HUB Class Descriptor wHubCharacteristics Bits 1, 0 PP1 PP2 PP3 PP4 PP5 0b00 Common in all ports 0b01 Port #1 Port #2 Port #3 Port #4 Port #5 Remark Connect pins PP1 to PP5 to the Port Power Control input pin of the power switch IC. Leave an unused or unavailable PP1 to PP5 pin open. |
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