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 underflow interrupt
to be serviced by the system controller.
7.4.3.3
Pulse Accumulator B Overflow Interrupt
This active high output will be asserted by the module to request a timer pulse accumulator B overflow
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 Overflow Interrupt
This active high output will be asserted by the module to request a timer pulse accumulator A overflow
interrupt to be serviced by the system controller.
7.4.3.6
Timer Overflow Interrupt
This active high output will be asserted by the module to request a timer overflow interrupt to be serviced
by the system controller.
Interrupt Source
Description
Timer channel 7–0
Modulus counter underflow
Pulse accumulator B overflow
Pulse accumulator A input
Pulse accumulator A overflow
Timer overflow
Active high timer channel interrupts 7–0
Active high modulus counter interrupt
Active high pulse accumulator B interrupt
Active high pulse accumulator A input interrupt
Pulse accumulator overflow interrupt
Timer 0verflow interrupt