NXP Semiconductors MPC5644A, Reference Manual, Page: 758 / 1735

Enhanced Time Processing Unit (eTPU2)
MPC5644A Microcontroller Reference Manual, Rev. 6
758 Freescale Semiconductor
24.3 External signal description
24.3.1 Overview
There are 69 external signals associated with each eTPU engine: 32 channel input signals, 32 channel
output signals, 4 output disable inputs, and TCRCLK clock input, totaling 138 in a dual-engine system.
These signals are described in
Table 24-1 .
Depending on the MCU integration, the input and output signals of a channel can be tied to one pin. In this
case, the direction of each channel signal, either output or input, is determined by the activation of an
output enable driver signal. eTPU provides one output buffer enable signal for each channel, controlled by
microcode.
The TCRCLK signal is used to clock TCR1/2 counters or gate the TCR2 clock. In Angle Mode it is used
as a tooth signal input. Refer to
Section 24.5.6, Time Bases , and Section 24.5.7, EAC – eTPU angle
counter , for proper use of this signal.
24.3.2 Detailed signal descriptions
24.3.2.1 ipp_do_etpuch_[1|2]([0 – 31]) — eTPU channel output signals
Each channel output signal is associated with a channel. The microcode may affect the logic level of an
output signal
1
by implementing one of two actions:
• Specify the logic level output to the signal when there is a match or a transition.
Table 24-1. eTPU signal properties
Name Direction Function Reset state Pull up
ipp_ind_etpuch_1(0) to
ipp_ind_etpuch_1(31)
Input eTPU engine 1 channel signals — MCU
dependent
ipp_do_etpuch_1(0) to
ipp_do_etpuch_1(31)
Output eTPU engine 1 channel signals 0 / Hi-Z
1
1
Value 0 refers to the reset value of the signal. Hi-Z refers to the state of the pads, if controlled by the eTPU output
buffer Enable signals, i.e., eTPU output buffer Enable resets in negated state.
MCU
dependent
ipp_ind_etpu_odis_1(0) to
ipp_ind_etpu_odis_1(3)
Input eTPU engine 1 output disable signals — MCU
dependent
ipp_ind_tcrclk_1 Input Clock/gate for eTPU engine 1 TCR counters;
entry of the tooth signal in Angle Mode
— MCU
dependent
ipp_ind_etpuch_2(0) to
ipp_ind_etpuch_2(31)
Input eTPU engine 2 channel signals — MCU
dependent
ipp_do_etpuch_2(0) to
ipp_do_etpuch_2(31)
Output eTPU engine 2 channel signals 0 / Hi-Z
1
MCU
dependent
ipp_ind_etpu_odis_2(0) to
ipp_ind_etpu_odis_2(3)
Input eTPU engine 2 output disable signals — MCU
dependent
ipp_ind_tcrclk_2 Input Clock/gate for eTPU engine 2 TCR counters;
entry of the tooth signal in Angle Mode
— MCU
dependent