TC1796
Peripheral Units (Vol. 2 of 2)
General Purpose Timer Array (GPTA)
User’s Manual
24-264
V2.0, 2007-07
GPTA, V2.0
System Control Unit
The SCU contains the external request unit (ERU), which is especially responsible for
controlling requests coming from the MSC modules, port pins, or from the GPTA0
module and passing these request to AD converters, DMA controller, or interrupt nodes.
MultiCAN Connections
The MultiCAN controller has two connections to the GPTA modules:
•
MultiCAN service request output SR15 is connected to the INT0 input of GPTA0,
GPTA1, and LTCA2.
•
GPTA0 output line OUT5 is connected to the external time trigger input ECTT3 of the
MultiCAN module.
DMA Controller
The external request unit generates four DMA request output signals (IOUT[3:0]) that
can be activated via port pins, the MSC clock outputs, or the six GPTA output lines.
Three of these four DMA request output signals are connected to the
GPTA0/GPTA1/LTCA2 internal inputs INT[3:1]. These connections allow, for example,
GTC or LTC events in the GPTA modules to be triggered by a request coming from a
port pin or from the MSC clock.
FADC Connections
As shown in
, eight GPTA0 output lines are connected as trigger input
signals or gating input signals to the channel trigger logic of the FADC. Thus dedicated
GPTA0 outputs can generate trigger events or act as gating signals for FADC channels.
Port Connections of Input IN1
The input lines IN1 of the GPTA0/GPTA1/LTCA2 modules are connected to the output
of a 4-to-1 multiplexer. This multiplexer is controlled by bit field SCU_CON.GIN1S and
allows the GPTA input lines IN1 to be connected to one out of four port input lines. This
feature especially allows the baud rates of an ASC0 of ASC1 receiver input signal to be
measured by timers of the GPTA.
Table 24-30 GPTA Input Line IN1 Connections
SCU_CON.GIN1S
GPTA1 Input IN1 Connected to
00
B
P2.9 / IN1 (default after reset)
01
B
P5.0 / RXD0A
10
B
P6.8 / RXD0B
11
B
P6.10 / RXD1B
