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PC87591L bảng dữ liệu(PDF) 51 Page - National Semiconductor (TI) |
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PC87591L bảng dữ liệu(HTML) 51 Page - National Semiconductor (TI) |
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51 / 437 page ![]() 2.0 Signal/Pin Description and Configuration (Continued) Revision 1.07 51 www.national.com 2.2.12 Mobile System Wake-Up Control (MSWC) 2.2.13 Timers and PWM 2.2.14 Universal Synchronous/Asynchronous Receiver/Transmitter (USART) Signal 128-Pin LQFP 176-Pin LQFP I/O Buffer Type Power Well Description RING 123 165 I INCS VCC Telephone Line Ring. Detection of a pulse train on this pin is a wake-up event that can activate the power-up request (PWUREQ). The pin has a Schmitt Trigger input buffer, powered by VCC. RI1 22 26 I INTS VCC Ring Indicator. When low, indicates that a telephone ring signal has been received by the modem. Ring signals are monitored during power-off for wake-up event detection. RI2 23 29 Signal 128-Pin LQFP 176-Pin LQFP I/O Buffer Type Power Well Description TA2 1 175 I/O INT, O1/2 VCC Timer Pin A for Timers 2 and 1. TA1 127 171 TB2 2 176 I INT VCC Timer Pin B for Timers 2 and 1. TB1 128 172 PWM7-0 33-26 43, 40-36, 32-33 OO3/6 VCC PWM Output 7-0. Signal 128-Pin LQFP 176-Pin LQFP I/O Buffer Type Power Well Description UTXD 114 154 O O2/4 VCC USART Transmit Data. URXD 113 153 I INT VCC USART Receive Data. USCLK 120 162 I/O INCS/O2/4 VCC USART Serial Clock. May be used as input or output when the USART is configured to operate in its synchronous mode of operation. |
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