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SAB82525H-V21 Datasheet(PDF) 15 Page - Siemens Semiconductor Group

Part No. SAB82525H-V21
Description  High-Level Serial Communication Controller Extended
Download  126 Pages
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

SAB82525H-V21 Datasheet(HTML) 15 Page - Siemens Semiconductor Group

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Semiconductor Group
15
82525
82526
82525
82526
SAB
SAB
SAF
SAF
Pin Definitions and Functions (cont’d)
Pin No.
Symbol
Input (I)
Output (O)
Function
40
38
DRQTA
DRQTB
O
DMA Request Transmitter (channel A/channel B)
The transmitter of the HSCX requests a DMA data transfer
by activating this line.
The DRQTn remains high as long as the transmit FIFO
requires data transfers.
The amount of data bytes to be transferred from system
memory to the HSCX (= byte count) must be written first to
the XBCH, XBCL registers.
Always blocks of data (n x 32 bytes + REST, n = 0, 1,…)
are transferred till the byte count is reached.
DRQTn is deactivated immediately following the falling
edge of the last WR cycle.
41
VDD
I
Power supply + 5 V.
1
43
2
P-LCC P-MQFP


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