
Chapter 7 Enhanced Capture Timer (S12ECT16B8CV2)
MC9S12XDP512 Data Sheet, Rev. 2.17
Freescale Semiconductor
361
7.4.3
Interrupts
This section describes interrupts originated by the ECT block. The MCU must service the interrupt
requests.
Table 7-37 lists the interrupts generated by the ECT to communicate with the MCU.
Table 7-37. ECT Interrupts
The ECT only originates interrupt requests. The following is a description of how the module makes a
request and how the MCU should acknowledge that request. The interrupt vector offset and interrupt
number are chip dependent.
7.4.3.1
Channel [7:0] Interrupt
This active high output will be asserted by the module to request a timer channel 7–0 interrupt to be
serviced by the system controller.
7.4.3.2
Modulus Counter Interrupt
This active high output will be asserted by the module to request a modulus counter underow interrupt
to be serviced by the system controller.
7.4.3.3
Pulse Accumulator B Overow Interrupt
This active high output will be asserted by the module to request a timer pulse accumulator B overow
interrupt to be serviced by the system controller.
7.4.3.4
Pulse Accumulator A Input Interrupt
This active high output will be asserted by the module to request a timer pulse accumulator A input
interrupt to be serviced by the system controller.
7.4.3.5
Pulse Accumulator A Overow Interrupt
This active high output will be asserted by the module to request a timer pulse accumulator A overow
interrupt to be serviced by the system controller.
7.4.3.6
Timer Overow Interrupt
This active high output will be asserted by the module to request a timer overow interrupt to be serviced
by the system controller.
Interrupt Source
Description
Timer channel 7–0
Active high timer channel interrupts 7–0
Modulus counter underow
Active high modulus counter interrupt
Pulse accumulator B overow
Active high pulse accumulator B interrupt
Pulse accumulator A input
Active high pulse accumulator A input interrupt
Pulse accumulator A overow
Pulse accumulator overow interrupt
Timer overow
Timer 0verow interrupt