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16.4.5.8.2 Function
The CERQ provides a simple memory-mapped mechanism to clear a given bit in the
ERQ to disable the DMA request for a given channel. The data value on a register write
causes the corresponding bit in the ERQ to be cleared. Setting the CAER bit provides a
global clear function, forcing the entire contents of the ERQ to be cleared, disabling all
DMA request inputs.
If the NOP bit is set, the command is ignored. This allows you to set a single, byte-wide
register with a 32-bit write while not affecting the other registers addressed in the write.
In such a case the other three bytes of the word would all have their NOP bit set so that
that these register will not be affected by the write.
Reads of this register return all zeroes.
NOTE
Disable a channel's hardware service request at the source
before clearing the channel's ERQ bit.
16.4.5.8.3 Diagram
Bits
7
6
5
4
3
2
1
0
R
0
0
0
W
0
Reset
0
0
0
0
0
0
0
0
16.4.5.8.4 Fields
Field
Function
7
NOP
No Op enable
0b - Normal operation
1b - No operation, ignore the other bits in this register
6
CAER
Clear All Enable Requests
0b - Clear only the ERQ bit specified in the CERQ field
1b - Clear all bits in ERQ
5-4
—
Reserved
3-0
CERQ
Clear Enable Request
Clears the corresponding bit in ERQ.
Memory map/register definition
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
316
NXP Semiconductors
Содержание MWCT101 S Series
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