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MPC866P 数据表(PDF) 59 Page - Freescale Semiconductor, Inc |
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MPC866P 数据表(HTML) 59 Page - Freescale Semiconductor, Inc |
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59 / 92 page  MOTOROLA MPC866/859 Hardware Specifications 59 CPM Electrical Characteristics 12.7 SCC in NMSI Mode Electrical Specifications Table 22 shows the NMSI external clock timings. Table 23 shows the NMSI internal clock timings. Table 22. NMSI External Clock Timings Num Characteristic All Frequencies Unit Min Max 100 RCLK1 and TCLK1 width high 1 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 edge 2 2 Also applies to CD and CTS hold time when they are used as an external sync signal. 5.00 — ns 108 CD1 setup time to RCLK1 rising edge 5.00 — ns Table 23. NMSI Internal Clock Timings Num Characteristic All Frequencies Unit Min Max 100 RCLK1 and TCLK1 frequency 1 1 The ratios SyncCLK/RCLK1 and SyncCLK/TCLK1 must be greater 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 edge 2 2 Also applies to CD and CTS hold time when they are used as an external sync signals. 0.00 — ns 108 CD1 setup time to RCLK1 rising edge 40.00 — ns Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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