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M68HC08 Datasheet(PDF) 15 Page - Freescale Semiconductor, Inc |
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M68HC08 Datasheet(HTML) 15 Page - Freescale Semiconductor, Inc |
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15 / 332 page ![]() Table of Contents MC68HC908JB16 — Rev. 1.1 Technical Data Freescale Semiconductor Table of Contents 15 12.8.1 TxD (Transmit Data). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 12.8.2 RxD (Receive Data) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 12.9 I/O Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229 12.9.1 SCI Control Register 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229 12.9.2 SCI Control Register 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232 12.9.3 SCI Control Register 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 235 12.9.4 SCI Status Register 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 12.9.5 SCI Status Register 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242 12.9.6 SCI Data Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243 12.9.7 SCI Baud Rate Register . . . . . . . . . . . . . . . . . . . . . . . . . . . 244 Section 13. Clock Generator Module (CGM) 13.1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247 13.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 13.3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249 13.3.1 Reference Frequency Source (OSCXCLK) . . . . . . . . . . . . 250 13.3.2 Voltage Controlled Oscillator . . . . . . . . . . . . . . . . . . . . . . . 250 13.3.3 Reference Divider. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 13.3.4 VCO Frequency Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 13.3.5 Phase Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 13.3.6 Phase Detector Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 13.3.7 Lock Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 13.4 I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 13.4.1 CGM Power Supply Pins (VDDA, VSSA0, VSSA1) . . . . . . . .252 13.4.2 CGM1 Voltage Regulator Out (VREGA0). . . . . . . . . . . . . . .252 13.4.3 CGM2 Voltage Regulator In (VREGA1) . . . . . . . . . . . . . . . .252 13.4.4 External Filter Capacitor Pins (CGMXFC1, CGMXFC2) . . 253 13.4.5 CGM Clock Output Pins (CGMOUT1, CGMOUT2) . . . . . . 253 13.5 CGMXFC External Connections . . . . . . . . . . . . . . . . . . . . . . . 253 13.6 CGMOUT External Connections. . . . . . . . . . . . . . . . . . . . . . . 254 13.7 Calculation of VCO Frequency . . . . . . . . . . . . . . . . . . . . . . . . 254 13.8 Programming the PLL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255 13.9 CGM I/O Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255 |
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