Example

The 68HC908AZ60 contains two timer modules TIMA and TIMB. Each one of these modules is based on a 16-bit counter that can operate as a free-running counter or a modulo-up counter. TIMB module has 2 channels and 2 related input/output pins. Can we use the TIMB peripheral for PWM output and input capture components at once?

Timer Module B (TIMB) is supported in PE by the following devices: TIMB, TIMB0, TIMB1, TIMBfree, TIMB_PPG, TIMBPP, TIMB0PPG, TIMB1PPG.

It follows from the table in this chapter that:

• For the PWM component (in non-buffered mode), you use only one channel (for example, TIMB0). According to the columns, the component will use one channel and TIMBfree device, other channels will stay free, all other devices will be blocked.
• The Capture component, according to the columns, uses only one channel. Such channel is available: TIMB1 .
• Sharing of the TIMB peripheral by the PWM and Capture component is possible. There is no remaining free device on the timer peripheral.

Because the channels of this timer are sharing one prescaler, it is necessary to configure the same prescaler value for both the PWM component and the Capture component.