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33912 Datasheet(PDF) 36 Page - Freescale Semiconductor, Inc |
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33912 Datasheet(HTML) 36 Page - Freescale Semiconductor, Inc |
36 / 47 page Analog Integrated Circuit Device Data 36 Freescale Semiconductor 33912 FUNCTIONAL DEVICE OPERATIONS LOGIC COMMANDS AND REGISTERS REGISTER DEFINITIONS System Status Register - SYSSR The System Status Register (SYSSR) is always transferred with every SPI transmission and gives a quick system status overview. It summarizes the status of the Voltage Status Register (VSR), LIN Status Register (LINSR), High Side Status Register (HSSR), and the Low Side Status Register (LSSR). VMS - Voltage Monitor Status This read-only bit indicates that one or more bits in the VSR are set. 1 = Voltage Monitor bit set 0 = None Figure 21. Voltage Monitor Status LINS - LIN Status This read-only bit indicates that one or more bits in the LINSR are set. 1 = LIN Status bit set 0 = None Figure 22. LIN Status HSS - High Side Switch Status This read-only bit indicates that one or more bits in the HSSR are set. 1 = High Side Status bit set 0 = None Figure 23. High Side Status LSS - Low Side Switch Status This read-only bit indicates that one or more bits in the LSSR are set. 1 = Low Side Status bit set 0 = None Figure 24. Low Side Status Mode Control Register - MCR The Mode Control Register (MCR) allows switching between the operation modes and to configure the 33912. Writing the MCR will return the VSR. HVSE - High-Voltage Shutdown Enable This write-only bit enables/disables automatic shutdown of the high side and the low side drivers during a high-voltage VSOV condition. 1 = automatic shutdown enabled 0 = automatic shutdown disabled LINPE - LIN pull-up enable. This write-only bit enables/disables the 30kΩ LIN pull-up resistor in STOP and SLEEP Modes. This bit also controls the LIN bus wake-up threshold. 1 = LIN pull-up resistor enabled 0 = LIN pull-up resistor disabled Table 8. System Status Register S7 S6 S5 S4 Read VMS LINS HSS LSS VMS BATFAIL VDDOT VSUV VSOV LINS LINOC LINOT TXDOM RXSHORT Table 9. Mode Control Register - $0 C3 C2 C1 C0 Write HVSE LINPE MOD2 MOD1 Reset Value 11 - - Reset Condition POR POR - - HS2OP HS2CL HS1OP HS1CL HSS LS2OP LS2CL LS1OP LS1CL LSS |
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