Chapter 18 Gate Drive Unit (GDU2PHV2)MC9S12ZVMB Family Reference Manual Rev. 1.3582 NXP Semiconductors18.3.2.1 GDU Module Enable Register (GDUE)Module Base + 0x0000 Access: User read/write (1)1. Read: AnytimeWrite: Anytime, write protected bits only if GWP=0. On entry in stop mode bits GCSE0, GCPE and GFDE are cleared. After exitfrom stop mode write protected bits GCPE and GFDE can be written once when GWP=1.7 6 5 4 3 2 1 0RGWP GOVA0 0 0GCSE0 GCPE GFDEWReset 0 0 0 0 0 0 0 1= UnimplementedFigure 18-3. GDU Module Enable Register (GDUE)Table 18-2. GDUE Register Field DescriptionField Description7GWPGDU Write Protect— This bit enables write protection to be used for the write protectable bits. While clear, GWPallows write protectable bits to be written. When set GWP prevents any further writes to write protectable bits.Once set , GWP is cleared by reset.0 Write-protectable bits may be written1 Write-protectable bits cannot be written6GOVAGDU Overvoltage Action — This bit cannot be modified after GWP bit is set.0 If an overvoltage condition on GHD pin occurs and GHHDF is set the high-side FET pre-drivers are turned offand the low-side FET pre-drivers are turned on.1 If an overvoltage condition on GHD pin occurs and GHHDF is set the high-side FET pre-drivers and the low-side FET pre-drivers are turned off.2GCSE0GDU Current Sense Amplifier 0 Enable— This bit enables the current sense amplifier. See Section 18.4.8,“Current Sense Amplifier and Overcurrent Comparator0 Current sense amplifier 0 is disabled1 Current sense amplifier 0 is enabled1GCPEGDU Charge Pump Enable — This bit enables the charge pump. This bit cannot be modified after GWP bit isset. See Section 18.4.4, “Charge Pump0 Charge pump is disabled1 Charge pump is enabled0GFDEGDU FET Pre-Driver Enable — This bit enables the low-side and high-side FET pre-drivers. This bit cannot bemodified after GWP bit is set.See Section 18.4.2, “Low-Side FET Pre-Drivers and Section 18.4.3, “High-Side FETPre-Driver.0 Low-side and high-side drivers are disabled1 Low-side and high-side drivers are enabledNOTEIt is not allowed to set and clear GFDE bit periodically in orderto switch on and off the FET pre-drivers. In order to switch onand off the FET pre-drivers the PMF module has to be used tomask and un-mask the PWM channels.
