ST92E163-EPB/US STMicroelectronics, ST92E163-EPB/US Datasheet - Page 123
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ST92E163-EPB/US
Manufacturer Part Number
ST92E163-EPB/US
Description
KIT DEMO MASS STORAGE
Manufacturer
STMicroelectronics
Type
Microcontroller Programmerr
Datasheet
1.ST92E163-EPBUS.pdf
(230 pages)
Specifications of ST92E163-EPB/US
Contents
Programmer, Cable, Power Supply, Software, Manual and more
For Use With/related Products
ST9 MCUs
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MULTIFUNCTION TIMER (Cont’d)
8.2.5 Interrupt and DMA
8.2.5.1 Timer Interrupt
The timer has 5 different Interrupt sources, be-
longing to 3 independent groups, which are as-
signed to the following Interrupt vectors:
Table 22. Timer Interrupt Structure
The three least significant bits of the vector pointer
address represent the relative priority assigned to
each group, where 000 represents the highest pri-
ority level. These relative priorities are fixed by
hardware, according to the source which gener-
ates the interrupt request. The 5 most significant
bits represent the general priority and are pro-
grammed by the user in the Interrupt Vector Reg-
ister (T_IVR).
Each source can be masked by a dedicated bit in
the Interrupt/DMA Mask Register (IDMR) of each
timer, as well as by a global mask enable bit (ID-
MR.7) which masks all interrupts.
If an interrupt request (CM0 or CP0) is present be-
fore the corresponding pending bit is reset, an
overrun condition occurs. This condition is flagged
in two dedicated overrun bits, relating to the
Comp0 and Capt0 sources, in the Timer Flag Reg-
ister (T_FLAGR).
8.2.5.2 Timer DMA
Two Independent DMA channels, associated with
Comp0 and Capt0 respectively, allow DMA trans-
fers from Register File or Memory to the Comp0
Register, and from the Capt0 Register to Register
File or Memory). If DMA is enabled, the Capt0 and
Comp0 interrupts are generated by the corre-
sponding DMA End of Block event. Their priority is
set by hardware as follows:
– Compare 0 Destination — Lower Priority
– Capture 0 Source — Higher Priority
The two DMA request sources are independently
maskable by the CP0D and CM0D DMA Mask bits
in the IDMR register.
Overflow/Underflow
Interrupt Source
COMP 0
COMP 1
CAPT 0
CAPT 1
Vector Address
xxxx x110
xxxx x100
xxxx x000
ST92163R4 - MULTIFUNCTION TIMER (MFT)
The two DMA End of Block interrupts are inde-
pendently enabled by the CP0I and CM0I Interrupt
mask bits in the IDMR register.
8.2.5.3 DMA Pointers
The 6 programmable most significant bits of the
DMA Counter Pointer Register (DCPR) and of the
DMA Address Pointer Register (DAPR) are com-
mon to both channels (Comp0 and Capt0). The
Comp0 and Capt0 Address Pointers are mapped
as a pair in the Register File, as are the Comp0
and Capt0 DMA Counter pair.
In order to specify either the Capt0 or the Comp0
pointers, according to the channel being serviced,
the Timer resets address bit 1 for CAPT0 and sets
it for COMP0, when the D0 bit in the DCPR regis-
ter is equal to zero (Word address in Register
File). In this case (transfers between peripheral
registers and memory), the pointers are split into
two groups of adjacent Address and Counter pairs
respectively.
For peripheral register to register transfers (select-
ed by programming “1” into bit 0 of the DCPR reg-
ister), only one pair of pointers is required, and the
pointers are mapped into one group of adjacent
positions.
The DMA Address Pointer Register (DAPR) is not
used in this case, but must be considered re-
served.
Figure 70. Pointer Mapping for Transfers
between Registers and Memory
Counters
Address
Pointers
DMA
16 bit Counter
16 bit Counter
Comp0 16 bit
Comp0 DMA
Register File
Addr Pointer
Addr Pointer
Capt0 16 bit
Capt0 DMA
YYYYYY11(l)
YYYYYY10(h)
YYYYYY01(l)
YYYYYY00(h)
XXXXXX11(l)
XXXXXX10(h)
XXXXXX01(l)
XXXXXX00(h)
123/230
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