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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC885ZP80 датащи(PDF) 59 Page - NXP Semiconductors |
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MPC885ZP80 датащи(HTML) 59 Page - NXP Semiconductors |
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59 / 87 page  MPC885/MPC880 PowerQUICC Hardware Specifications, Rev. 7 Freescale Semiconductor 59 CPM Electrical Characteristics 12.7 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 RCLK1 and TCLK1 width high1 1 The ratios SyncCLK/RCLK1 and SyncCLK/TCLK1 must be greater than or equal to 2.25/1. 1/SYNCCLK — ns 101 RCLK1 and TCLK1 width low 1/SYNCCLK + 5 — ns 102 RCLK1 and TCLK1 rise/fall time — 15.00 ns 103 TXD1 active delay (from TCLK1 falling edge) 0.00 50.00 ns 104 RTS1 active/inactive delay (from TCLK1 falling edge) 0.00 50.00 ns 105 CTS1 setup time to TCLK1 rising edge 5.00 — ns 106 RXD1 setup time to RCLK1 rising edge 5.00 — ns 107 RXD1 hold time from RCLK1 rising edge2 2 Also applies to CD and CTS hold time when they are used as external sync signals. 5.00 — ns 108 CD1 setup time to RCLK1 rising edge 5.00 — ns Table 23. NMSI Internal Clock Timing Num Characteristic All Frequencies Unit Min Max 100 RCLK1 and TCLK1 frequency1 1 The ratios SyncCLK/RCLK1 and SyncCLK/TCLK1 must be greater than or equal to 3/1. 0.00 SYNCCLK/3 MHz 102 RCLK1 and TCLK1 rise/fall time — — ns 103 TXD1 active delay (from TCLK1 falling edge) 0.00 30.00 ns 104 RTS1 active/inactive delay (from TCLK1 falling edge) 0.00 30.00 ns 105 CTS1 setup time to TCLK1 rising edge 40.00 — ns 106 RXD1 setup time to RCLK1 rising edge 40.00 — ns 107 RXD1 hold time from RCLK1 rising edge2 2 Also applies to CD and CTS hold time when they are used as external sync signals 0.00 — ns 108 CD1 setup time to RCLK1 rising edge 40.00 — ns |
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