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LM8322 Datasheet(PDF) 23 Page - National Semiconductor (TI) |
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LM8322 Datasheet(HTML) 23 Page - National Semiconductor (TI) |
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23 / 42 page  14.11 SELECTABLE SCRIPT EXAMPLE Multiple scripts can be placed in a single buffer. The script which is executed is selected by the address in the parameter to the PWM_START command (0x96). Script Command Address PWM_WRITE Parameter 1 PWM_WRITE Parameter 2 PWM_WRITE Parameter 3 Script Command Description 0x00 Script 1 0x01 0x40 0x00 Set PWM_0 to 0% duty cycle 0x01 0x05 0x0F 0x33 Ramp up 51 steps 0x02 0x09 0xC0 0x00 Keep channel at 20% duty cycle 0x03 Script 2 0x0D 0x40 0xFF Set PWM_0 to 100% duty cycle 0x04 0x11 0x0F 0xD5 Ramp down 85 steps 0x05 0x15 0xC0 0x00 Keep channel at 66.6% duty cycle 0x06 Script 3 0x19 0x40 0x00 Set PWM_0 to 0% duty cycle 0x07 0x1D 0x07 0x7E Ramp up 126 steps 0x08 0x21 0x07 0x7E Ramp up 126 steps 0x09 0x25 0x07 0xFE Ramp down 126 steps 0x0A 0x29 0x07 0xFE Ramp down 126 steps 0x0B 0x2D 0xA5 0x07 Loop ten times to script address 0x07 0x0C Script 4 0x31 0xC8 0x00 Switch PWM_0 off (script 3 automatically enters here) 0x0D Script 5 0x35 0x40 0x00 Set PWM_0 to 0% duty cycle 0x0E 0x39 0x07 0x25 Ramp up 37 steps 0x0F 0x3D 0xC0 0x00 Keep channel at 14.5% duty cycle 0x10 Script 6 0x41 0x40 0x00 Set PWM_0 to 0% duty cycle 0x11 (Alternates between 25% and 75% duty cycle) 0x45 0x01 0x40 Ramp up 64 steps 0x12 0x49 0x3F 0x7E Ramp up 126 steps 0x13 0x4D 0x3F 0xFE Ramp down 126 steps 0x14 0x51 0xA0 0x12 Always branch to script address 0x12 0x15 Script 7 ..... 0x3B To set a fixed duty cycle on a PWM channel requires 3 steps (see script 1 for duty cycles from 0% to 49% and script 2 for duty cycles from 51% to 100%). To keep a PWM channel active providing a fixed duty cycle on its output, the script must terminate with the END com- mand leaving the RESET bit clear. To switch this channel off, the host must send another PWM_START command (0x96 followed by the parameter bytes) triggering the single com- mand described in script 4. This END command will set the RESET bit and the dedicated PWM output will be disabled. Script 3 will automatically enter into this command when the 10 loops of ramping up and down are executed. Script 7 can be finished by two commands: • PWM_STOP command with parameter 0x01 • PWM_START command with parameter 0x31 (start PWM_0 from address 0x0C to run script 4) The script address is the physical address to be used from BRANCH instructions inside the script file buffer. The param- eter 1 byte contains the same address with the 2 channel bits appended and will be associated with the PWM_START com- mand. 23 www.national.com |
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