Motorola DSP56303 User Manual page 10

9.1.2 Individual Timer Block Diagram........................................................................................... 9-2
9.2 Operation ............................................................................................................................... 9-3
9.2.1 Timer After Reset .................................................................................................................. 9-3
9.2.2 Timer Initialization ................................................................................................................ 9-4
9.2.3 Timer Exceptions ................................................................................................................... 9-4
9.3 Operating Modes.................................................................................................................... 9-5
9.3.1 Triple Timer Modes ............................................................................................................... 9-6
9.3.1.1 Timer GPIO (Mode 0) ..................................................................................................... 9-6
9.3.1.2 Timer Pulse (Mode 1) ...................................................................................................... 9-8
9.3.1.3 Timer Toggle (Mode 2) ................................................................................................. 9-10
9.3.1.4 Timer Event Counter (Mode 3) ..................................................................................... 9-12
9.3.2 Signal Measurement Modes................................................................................................. 9-14
9.3.2.1 Measurement Input Width (Mode 4) ............................................................................. 9-14
9.3.2.2 Measurement Input Period (Mode 5)............................................................................. 9-16
9.3.2.3 Measurement Capture (Mode 6) .................................................................................... 9-18
9.3.3 Pulse Width Modulation (PWM, Mode 7)........................................................................... 9-19
9.3.4 Watchdog Modes ................................................................................................................. 9-22
9.3.4.1 Watchdog Pulse (Mode 9) ............................................................................................. 9-22
9.3.4.2 Watchdog Toggle (Mode 10)......................................................................................... 9-24
9.3.4.3 Reserved Modes............................................................................................................. 9-25
9.3.5 Special Cases ....................................................................................................................... 9-25
9.3.6 DMA Trigger ....................................................................................................................... 9-25
9.4 Triple Timer Module Programming Model ......................................................................... 9-25
9.4.1 Prescaler Counter ................................................................................................................. 9-25
9.4.2 Timer Prescaler Load Register (TPLR) ............................................................................... 9-27
9.4.3 Timer Prescaler Count Register (TPCR) ............................................................................. 9-28
9.4.4 Timer Control/Status Register (TCSR)................................................................................ 9-28
9.4.5 Timer Load Register (TLR) ................................................................................................. 9-33
9.4.6 Timer Compare Register (TCPR) ........................................................................................ 9-34
9.4.7 Timer Count Register (TCR) ............................................................................................... 9-34
A
Appendix
Bootstrap Program
A.1 Bootstrap Code ..................................................................................................................... A-1
A.2 Equates for I/O Port Programming ....................................................................................... A-8
A.3 Host Interface (HI08) Equates .............................................................................................. A-9
A.4 Serial Communications Interface (SCI) Equates ................................................................ A-10
A.5 Enhanced Synchronous Serial Interface (ESSI) Equates.................................................... A-11
A.6 Exception Processing Equates ............................................................................................ A-13
A.7 Timer Module Equates........................................................................................................ A-14
A.8 Direct Memory Access (DMA) Equates............................................................................. A-15
A.9 Phase Locked Loop (PLL) equates ..................................................................................... A-17
A.10 Bus Interface Unit (BIU) Equates....................................................................................... A-18
A.11 Interrupt Equates................................................................................................................. A-20
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