PXS20RM Datasheet, PDF (248/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Cross-Triggering Unit (CTU)
The CTU interfaces to the following peripherals: (1) PWM (13 inputs); (2) Timers (2 inputs); (3) GPIO,
i.e. an external signal (1 input). The 16 input signals are digital signals and the CTU must be able to detect
a rising and/or a falling edge for each of them.
The CTU comprises the:
• Input signals interface
• User interface (configuration registers and so on)
• ADC interface
• Timers interface
The block diagram of the CTU is shown in Figure 13-1. The CTU consists of two subunits:
• Trigger generator subunit
• Scheduler subunit
The trigger generator subunit handles incoming signals, selecting for each signal, the active edges to
generate the Master Reload signal, and generates up to eight trigger events (signals). The scheduler subunit
generates the trigger event output according to the occurred trigger event (signal).
13.4 Functional description
13.4.1 Interaction with other peripherals
Figure 13-2 shows how the CTU interacts with the following peripherals:
• ADC
• DSPI
• eTimer
• FlexPWM
• FlexRay
13-2
PXS20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor