HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 268
HD64570
Manufacturer Part Number
HD64570
Description
Serial Communications Adaptor
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD64570.pdf
(469 pages)
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Bit 3: Reserved. This bit always reads 0 and must be set to 0.
Bit 2 (NF: Number of DMA Frames): The function of this bit is described below.
Bit 1 (CNTE : Frame End Interrupt Counter Enable/Disable): The function of this bit is
described below.
Bit 0: Reserved. This bit always reads 0 and must be set to 0.
6.2.9
The frame end interrupt counter (FCT), provided for each of channels 0, 1, 2, and 3, counts the
unprocessed interrupt requests which have occurred during multi-frame chained-block transfer.
This is a 4-bit read-only counter.
Rev. 0, 07/98, page 252 of 453
Single-block transfer mode
Reserved. When read, the value of this bit is undefined. This bit can be set to 0 or 1.
Chained-block transfer mode
The NF bit specifies either single- or multi-frame chained-block transfer mode as follows.
This bit is reset to 0.
NF = 0: Specifies single-frame mode
NF = 1: Specifies multi-frame mode
Single-block transfer mode
The CNTE bit must be set to 0.
Chained-block transfer mode
The CNTE bit enables or disables the frame end interrupt counter (FCT) as follows. See
section 6.2.7, DMA Status Register (DSR), and section 6.2.9, Frame End Interrupt Counter
(FCT). This bit is reset to 0.
CNTE = 0: Disables FCT
CNTE = 1: Enables FCT
Frame End Interrupt Counter (FCT)
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