CP3-TB-BT26-0 National Semiconductor, CP3-TB-BT26-0 Datasheet - Page 46
CP3-TB-BT26-0
Manufacturer Part Number
CP3-TB-BT26-0
Description
BOARD TARGET FOR CP3BT26
Manufacturer
National Semiconductor
Type
Microcontrollerr
Datasheet
1.CP3-TB-BT26-0.pdf
(280 pages)
Specifications of CP3-TB-BT26-0
Contents
*
For Use With/related Products
CP3BT26
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
Q1879090A
- Current page: 46 of 280
- Download datasheet (5Mb)
www.national.com
9.6.8
The DMA status register is a byte-wide, read register that
holds the status information for the DMA channel n. This
register is cleared at reset. The reserved bits always return
zero when read. The VLD, OVR and TC bits are sticky (once
set by the occurrence of the specific condition, they remain
set until explicitly cleared by software). These bits can be in-
dividually cleared by writing 1 to the bit positions in the DM-
ASTAT register to be cleared. Writing 0 to these bits has no
effect
TC
OVR
CHAC
VLD
7
Reserved
DMA Status Register (DMASTAT)
The Terminal Count bit indicates whether the
transfer was completed by a terminal count
condition (BLTCn Register reached 0).
0
1
The behavior of the Channel Overrun bit de-
pends on the operation mode (single buffer,
double buffer, or auto-initialize) of the DMA
channel.
In double-buffered mode (DMACNTLn.OT =
0):
The OVR bit is set when the present transfer
is completed (BLTCn = 0), but the parameters
for the next transfer (address and block
length) are not valid (DMASTAT.VLD = 0).
In auto-initialize mode (DMACNTLn.OT = 1):
The OVR bit is set when the present transfer
is completed (BLTCn = 0), and the DMAS-
TAT.TC bit is still set.
In single-buffer mode:
Operates in the same way as double-buffer
mode. In single-buffered mode, the DMAS-
TAT.VLD bit should always be clear, so it will
also be set when the DMASTAT.TC bit is set.
Therefore, the OVR bit can be ignored in this
mode.
The Channel Active bit continuously indicates
the active or inactive status of the channel,
and therefore, it is read only. Data written to
the CHAC bit is ignored.
0
1
The Transfer Parameters Valid bit specifies
whether the transfer parameters for the next
block to be transferred are valid. Writing the
BLTRn register automatically sets this bit. The
bit is cleared in the following cases:
! The present transfer is completed and the
! Writing 1 to the VLD bit.
–
–
–
–
ADRAn, ADRBn (indirect mode only), and
BLTR registers are copied to the ADCAn,
ADCBn (indirect mode only), and BLTCn
registers.
Terminal count condition did not occur.
Terminal count condition occurred.
Channel inactive.
Indicates that the channel is active
(CHEN bit in the CNTLn register is 1 and
BLTCn > 0)
4
VLD CHAC OVR
3
2
1
TC
0
46
Related parts for CP3-TB-BT26-0
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
National Semiconductor [8-Bit D/A Converter]
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
National Semiconductor [Media Coprocessor]
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
AC97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound
Manufacturer:
National Semiconductor
Part Number:
Description:
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
General Purpose, Low Voltage, Low Power, Rail-to-Rail Output Operational Amplifiers
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
8-bit 20 MSPS flash A/D converter.
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Low Noise Quad Operational Amplifier
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Quad Differential Line Receivers
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Quad High Speed Trapezoidal? Bus Transceiver
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Dual Line Receiver
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
TTL to 10k ECL Level Translator with Latch
Manufacturer:
National Semiconductor
Datasheet: