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MPC875EC Datasheet(PDF) 57 Page - Freescale Semiconductor, Inc |
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MPC875EC Datasheet(HTML) 57 Page - Freescale Semiconductor, Inc |
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57 / 84 page  MPC875/MPC870 Hardware Specifications, Rev. 3.0 57 PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE Freescale Semiconductor CPM Electrical Characteristics 13.6 SCC in NMSI Mode Electrical Specifications Table 22 provides the NMSI external clock timing. Table 23 provides the NMSI internal clock timing. Table 22. NMSI External Clock Timing Num Characteristic All Frequencies Unit Min Max 100 RCLK3 and TCLK3 width high 1 1 The ratios SyncCLK/RCLK3 and SyncCLK/TCLK3 must be greater than or equal to 2.25/1. 1/SYNCCLK — ns 101 RCLK3 and TCLK3 width low 1/SYNCCLK +5 — ns 102 RCLK3 and TCLK3 rise/fall time — 15.00 ns 103 TXD3 active delay (from TCLK3 falling edge) 0.00 50.00 ns 104 RTS3 active/inactive delay (from TCLK3 falling edge) 0.00 50.00 ns 105 CTS3 setup time to TCLK3 rising edge 5.00 — ns 106 RXD3 setup time to RCLK3 rising edge 5.00 — ns 107 RXD3 hold time from RCLK3 rising edge 2 2 Also applies to CD and CTS hold time when they are used as external sync signals. 5.00 — ns 108 CD3 setup time to RCLK3 rising edge 5.00 — ns Table 23. NMSI Internal Clock Timing Num Characteristic All Frequencies Unit Min Max 100 RCLK3 and TCLK3 frequency 1 1 The ratios SyncCLK/RCLK3 and SyncCLK/TCLK3 must be greater or equal to 3/1. 0.00 SYNCCLK/3 MHz 102 RCLK3 and TCLK3 rise/fall time — — ns 103 TXD3 active delay (from TCLK3 falling edge) 0.00 30.00 ns 104 RTS3 active/inactive delay (from TCLK3 falling edge) 0.00 30.00 ns 105 CTS3 setup time to TCLK3 rising edge 40.00 — ns 106 RXD3 setup time to RCLK3 rising edge 40.00 — ns 107 RXD3 hold time from RCLK3 rising edge 2 2 Also applies to CD and CTS hold time when they are used as external sync signals 0.00 — ns 108 CD3 setup time to RCLK3 rising edge 40.00 — ns |
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