TC1784
General Purpose Timer Array (GPTA
®
v5)
User´s Manual
21-72
V1.1, 2011-05
GPTA
®
v5, V1.14
Data Input Line Control
The data input line LTCkIN can operate in two modes (selected by bit LTCCTRk.ILM):
•
Level Sensitive or
•
Edge Sensitive.
In Edge Sensitive Mode, the active edges are selected by bits LTCCTRk.FED and
LTCCTRk.RED. For the Level Sensitive Mode, the active level of the input signal can be
selected by bit FED/AIL of register LTCCTRk.
Depending on which source is selected for the input line by the input multiplexer,
different clocking modes of the LTC cell are possible (
Table 21-3
LTC Data Input Line Operation (in Timer Mode)
Input Source
Level Sensitive Input Line
LTCCTRk.ILM = 1
Edge Sensitive Input Line
LTCCTRk.ILM = 0
External Signal
(Port line)
The external signal operates as
gating signal for the cell. The active
input level can be selected with
control register bit AIL.
Additionally, the LTC prescaler
mode can be enabled with
LTCCTRk.PEN to reduce the timer
frequency.
The programmed function of the
LTC is performed with the
GPTA
®
v5 module clock frequency,
or with the programmed prescaler
clock LTCPRE (see
The programmed function of the
LTC cell is performed on selected
edge(s).
Internal Clock
Bus Line or
PDL output or
INT input
The programmed function is
performed with the internal clock or
PDL/INT signal. Note that all
internal clock bus lines and PDL
signals are active high pulses. The
LTC Prescaler Mode and the input
signal inversion must not be used.
The programmed function of the
LTC cell is performed on selected
edge(s).
In case of full speed GPTA
®
v5
module clock selection as input
clock, the Level Sensitive Mode
must be selected. The Edge
Sensitive Mode will not produce
an event in this special case.
Содержание TC1784
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