i2c clock from global clock value, syntax corrections
pwm channel 7 correction, enhanced mode
PWM - legacy mode, LOAD use for updating
spi - disable rx/tx fifo, write/readable flags change
PWM - mux addition
PWM - pwmload removed from the objects header file
PWM channels definition update, serial uses external global variable system clock
Merge branch 'master' into dev_k20d5m_testing
clk freq header file

	- HAL clock improvement
Merge pull request #144 from 0xc0170/dev_k20d5m_testing

K20D50M target - pwm and clocks in HAL