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CS5535-UDC Datasheet(PDF) 44 Page - National Semiconductor (TI) |
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CS5535-UDC Datasheet(HTML) 44 Page - National Semiconductor (TI) |
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44 / 555 page  www.national.com 44 Revision 0.8 Signal Definitions (Continued) 2.2.8.1 GPIO Functions and Recommended Usage Functions listed in Table 2-9 are functions that may be assigned to specific GPIO balls. The “Ball No.” column gives the ball that must be used if this function is selected, and the “GPIOx” column gives the GPIO that the function is associated with. Table 2-9. GPIOx Available Functions Descriptions Function Name Ball No. GPIO[x] Type Description 32KHZ C8 GPIO27 O 32 kHz Clock. When invoked, this ball produces a buffered output of the 32 kHz clock provided on the 32kHz XCI and XCO pins. This option is invoked by selecting the AUX_OUT_2 option of GPIO27. Note that since GPIO27 is in the Standby power domain, the 32 kHz clock output will continue in Sleep and Standby states. AC_BEEP K3 GPIO1 O Legacy PC/AT Speaker Beep. Connect to codec’s PC_BEEP. DDC_SCL E1 GPIO3 I/O DDC Serial Clock. This is a “recommended use” for GPIO3, because this is one of the few GPIOs that have a high drive capac- ity, open-drain output. The serial clock function must be imple- mented in software to support DDC monitors. There is no dedicated DDC clock function within the CS5535. DDC_SDA E2 GPIO4 I/O DDC Serial Data. This is a “recommended use” for GPIO4, because this is one of the few GPIOs that have a high drive capac- ity, open-drain output. The serial data function must be imple- mented in software to support DDC monitors. There is no dedicated DDC data function within the CS5535. LOW_BAT# A9 GPIO25 I Low Battery Detect. This is a “recommended use” for GPIO25 in battery-powered systems. It is invoked by setting GPIO25 to the AUX_IN mode. The signal is intended to be driven low by an exter- nal circuit when the battery voltage falls below a preset value (determined by the external circuit). It could be used to generate a PME (interrupt) - connected to LowBat function in the Power Man- agement Controller that would then de-assert WORKING and WORK_AUX, if no software action is taken within a programmable time. MFGPT0_C1 D3 GPIO5 O Multi-Function General Purpose Counter #0 - Compare 1 Out. An output from the counter that, when asserted, indicates the counter has reached the conditions set up in the counter’s Compare 1 registers. MFGPT0_C2 K3 GPIO1 O Multi-Function General Purpose Counter #0 - Compare 2 Out. An output from the counter that, when asserted, indicates the counter has reached the conditions set up in the counter’s Compare 2 registers. MFGPT0_RS D2 GPIO6 I Multi-Function General Purpose Counter #0 - Restart. An input to the counter that causes it to be reset to initial conditions and then to resume counting. MFGPT1_C1 D2 GPIO6 O Multi-Function General Purpose Counter #1 - Compare 1 Out. An output from the counter that, when asserted, indicates the counter has reached the conditions set up in the counter’s Compare 1 registers. MFGPT1_C2 A1 GPIO11 O Multi-Function General Purpose Counter #1 - Compare 2 Out. An output from the counter that, when asserted, indicates the counter has reached the conditions set up in the counter’s Compare 2 registers. MFGPT1_RS D3 GPIO5 I Multi-Function General Purpose Counter #1 - Restart. An input to the counter that causes it to be reset to initial conditions and then to resume counting. |
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