TC1796
Peripheral Units (Vol. 2 of 2)
General Purpose Timer Array (GPTA)
User’s Manual 24-112 V2.0, 2007-07
GPTA, V2.0
24.2.5 Interrupt Sharing Unit (IS)
The GPTA provides 111 service request sources. These service request sources are
generated by different cell types, as shown in Table 24-13.
To reduce hardware and software overhead, at maximum five request sources are
combined together in service request groups. A service request group has up to five
service request inputs and one service request output SRy which is typically connected
outside the GPTA kernel with a standard interrupt node y and controlled by its SRCy
register.
Figure 24-72 Service Request Groups
The bits in the Service Request State Registers (SRSSx and SRSCx) are service
request status flags that are set by hardware (type “h”) when the related event occurs.
Each GPTA service request source has its own service request flag. This flag is normally
set by hardware but can be set and cleared by software. Each service request status flag
can be read twice, at the same bit location in the SRSCx register and in the SRSSx
Table 24-13 GPTA Number of Service Request Sources
Cell Type Number of Cells Number of Service Request
Sources/Cell
Total Number of
Request Sources
DCM 4 3 12
PLL 1 1 1
GT 2 1 2
GTC 32 1 32
LTC 64 1 64
Sum: 111
MCA05981
At maximum
five Request Sources from
DCM, PLL, GT, GTC, LTC
Service
Request
Node y
(SRCy Register)
Service Request
Group y
SRy
≥1
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