Chapter 12 Pulse-Width Modulator (S12PWM8B8CV1)
MC9S12XDP512 Data Sheet, Rev. 2.11
Freescale Semiconductor 589
Figure 12-24. PWM 16-Bit Mode
Once concatenated mode is enabled (CONxx bits set in PWMCTL register), enabling/disabling the
corresponding 16-bit PWM channel is controlled by the low order PWMEx bit. In this case, the high order
bytes PWMEx bits have no effect and their corresponding PWM output is disabled.
In concatenated mode, writes to the 16-bit counter by using a 16-bit access or writes to either the low or
high order byte of the counter will reset the 16-bit counter. Reads of the 16-bit counter must be made by
16-bit access to maintain data coherency.
PWMCNT6 PWCNT7
PWM7
Clock Source 7 High Low
Period/Duty Compare
PWMCNT4 PWCNT5
PWM5
Clock Source 5
High Low
Period/Duty Compare
PWMCNT2 PWCNT3
PWM3
Clock Source 3
High Low
Period/Duty Compare
PWMCNT0 PWCNT1
PWM1
Clock Source 1
High Low
Period/Duty Compare