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USB7252P 数据表(PDF) 17 Page - Microchip Technology |
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USB7252P 数据表(HTML) 17 Page - Microchip Technology |
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17 / 64 page ![]() 2018 - 2020 Microchip Technology Inc. DS00003561A-page 17 USB7252P External 25 MHz Crystal Output XTALO OCLK External 25 MHz crystal output Float (only if sin- gle-ended clock is connected to CLK_IN) Configuration Straps Port 4-1 D+ Disable Configuration Strap PRT_DIS_P[4:1] I Port 4-1 D+ Disable Configuration Strap. These configuration straps are used in con- junction with the corresponding PRT_DIS_M[4:1] straps to disable the related port (4-1). See Note 3-13. Both USB data pins for the corresponding port must be tied to 3.3V to disable the associated downstream port. N/A Port 4-1 D- Disable Configuration Strap PRT_DIS_M[4:1] I Port 4-1 D- Disable Configuration Strap. These configuration straps are used in con- junction with the corresponding PRT_DIS_P[4:1] straps to disable the related port (4-1). See Note 3-13. Both USB data pins for the corresponding port must be tied to 3.3V to disable the associated downstream port. Mandatory Note 3-12 Non-Removable Ports Configuration Strap CFG_NON_REM I Non-Removable Ports Configuration Strap. This configuration strap controls the number of reported non-removable ports. See Note 3-13 . Note 3-10 Mandatory if external SPI memory is not used for firmware e xe cu tion . If external SPI memory is us ed fo r firmwa re ex ec utio n, the n configuration strap resistor should be omitted. Note 3-10 TABLE 3-1: PIN DESCRIPTIONS (CONTINUED) Name Symbol Buffer Type Description If Unused |
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