ST92F150-EVAL STMicroelectronics, ST92F150-EVAL Datasheet - Page 301
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ST92F150-EVAL
Manufacturer Part Number
ST92F150-EVAL
Description
BOARD EVALUATION FOR ST9 SERIES
Manufacturer
STMicroelectronics
Specifications of ST92F150-EVAL
Processor To Be Evaluated
ST90158 and ST92F1x Daughter Board
Interface Type
I2C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
497-2905
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J1850 BYTE LEVEL PROTOCOL DECODER (Cont’d)
10.9.6.3 DMA Management in Reception Mode
The DMA in reception is performed when the
RDRF bit of the STATUS register is set (by hard-
ware). The RDRF bit is reset as soon as the DMA
cycle is finished.
To enable the DMA feature, the RXD_M bit of the
IMR register must be set (by software).
Each DMA request performs the transfer of a sin-
gle byte from the RXDATA register of the peripher-
al toward Register File or Memory Space
139).
Each DMA transfer consists of three operations
that are performed with minimum use of CPU time:
– A load from the JBLPD data register (RXDATA)
Figure 139. DMA in Reception Mode
to a location of Register File/Memory addressed
JBLPD peripheral
RXDATA
(Figure
J1850 Byte Level Protocol Decoder (JBLPD)
– A post-increment of the DMA Address Register
– A post-decrement of the DMA transaction coun-
Note: When the REOBP pending bit is set (at the
end of the last DMA transfer), the reception DMA
enable bit (RXD_M) is automatically reset by hard-
ware. However, the DMA can be disabled by soft-
ware resetting the RXD_M bit.
Note: The DMA request acknowledge could de-
pend on the priority level stored in the PRLR regis-
ter.
through the DMA Address Register (or Register
pair);
(or Register pair);
ter, which contains the number of transactions
that have still to be performed.
Data received
Previous data
Memory space
Register File
Current
Address
Pointer
or
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