talking about things people are confused about, like the watchdog timer
pins configged as GPIO by default
only ports 1,2 do intterupts

do not write to PxIN, higher current consumption
output reg PxOUT
PxDIR for i/o selection
PxSEL 0 means regular GPIO, 1 for peripheral module function

when you use peripherals, you lose GPIO pins

interrupt flag regs, P[12]IFG, 1 for interrupt flagged, transitions cause interrupts
int trans flags P[12]IES, 1 sets int on falling edge, 0 sets int on rising edge

timers
16 bit, 4 op modes
configurable clock src
3 or 5 independently configable cap/comp regs with configurable inputs
3/5 output modules with 8 putput modes
multiple simultaneous timings, multiple capture/comp, multiple output waveforms such as pwm sigs and any combination of these
interrupt capabilities
timer counting modes
halt
up/down 0-CCR0-0
up mode 0-CCR0
continuous 0-0xFFFF

can select from several different source clocks
interrupts can trigger on CCR1,CCR2 or can toggle bits