User guide

DS4830A User’s Guide
6
SECTION 13 – 3-WIRE ....................................................................................................................................................... 121
13.1 – Detailed Description ............................................................................................................................................. 121
13.1.1 – Operation ....................................................................................................................................................... 121
13.2 – 3-Wire Register Descriptions ................................................................................................................................ 123
SECTION 14 – PWM .......................................................................................................................................................... 124
14.1 – Detailed Description ............................................................................................................................................. 124
14.1.1 – PWMCN and PWMDATA SFRs .................................................................................................................... 124
14.1.2 – PWMSYNC SFR ............................................................................................................................................ 125
14.2 – Individual PWM Channel Operation ..................................................................................................................... 126
14.2.1 – Duty Cycle Register (DCYCn) ....................................................................................................................... 126
14.2.2 – PWM Configuration Register (PWMCFGn) ................................................................................................... 127
14.2.3 – PWM DELAY Register (PWMDLYn) .............................................................................................................. 131
14.3 – PWM Output Register Descriptions ...................................................................................................................... 132
14.4 – PWM Output Code Examples .............................................................................................................................. 137
SECTION 15 – GENERAL-PURPOSE INPUT/OUTPUT (GPIO) PINS ............................................................................. 138
15.1 – Overview ............................................................................................................................................................... 138
15.2 – GPIO Port Register Descriptions .......................................................................................................................... 141
15.2.1 – GPIO Direction Register Port (PD0, PD1, PD2, and PD6) ............................................................................ 141
15.2.2 – GPIO Output Register Port (PO0, PO1, PO2, and PO6)............................................................................... 141
15.2.3 – GPIO Input Register for Port (PI0, PI1, PI2, and PI6) ................................................................................... 141
15.2.4 – GPIO Port External Interrupt Edge Select Register (EIES0, EIES1, EIES2, and EIES6) ............................. 141
15.2.5 – GPIO Port External Interrupt Flag Register (EIF0, EIF1, EIF2, and EIF6) .................................................... 142
15.2.6 – GPIO Port External Interrupt Enable Register (EIE0, EIE1, EIE2, and EIE6) ............................................... 142
15.3 – GPIO Code Example ............................................................................................................................................ 142
15.3.1 – GPIO Pin as Output ....................................................................................................................................... 142
15.3.2 – GPIO High-Impedance Input ......................................................................................................................... 142
15.3.3 – GPIO Weak Pullup Input ................................................................................................................................ 142
15.3.4 – GPIO Open-Drain Output .............................................................................................................................. 142
SECTION 16 – GENERAL-PURPOSE TIMERS ................................................................................................................ 143
16.1 – Detailed Description ............................................................................................................................................. 143
16.1.1 – Timer Modes .................................................................................................................................................. 143
16.1.2 – Clock Selection .............................................................................................................................................. 144
16.1.3 – Timer Clock Prescaler ................................................................................................................................... 144
16.2 – Timer Register Descriptions ................................................................................................................................. 145
SECTION 17 – SUPPLY VOLTAGE MONITOR (SVM)...................................................................................................... 147
SECTION 18 – HARDWARE MULTIPLIER MODULE ....................................................................................................... 148
18.1 – Hardware Multiplier Organization ......................................................................................................................... 148
18.2 – Hardware Multiplier Controls ................................................................................................................................ 148
18.3 – Register Output Selection .................................................................................................................................... 149
18.3.1 – Signed-Unsigned Operand Selection ............................................................................................................ 149
18.3.2 – Operand Count Selection .............................................................................................................................. 149
18.4 – Hardware Multiplier Operations ............................................................................................................................ 149