PXD10RM Datasheet, PDF (506/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

Table 15-28. TCDn Word 7 (TCDn.{biter, control/status}) field descriptions (continued)
Name
biter[0:5]
or
biter.linkch[0:5]
Description
Beginning “major” iteration count
or
Beginning Link channel number
Value
This is the initial value copied into the citer field or
citer.linkch field when the major loop is completed.
The citer fields controls the iteration count and linking
during channel execution.
if (TCD.biter.e_link = 0) then
No channel-to-channel linking (or chaining) is
performed after the inner "minor" loop is exhausted.
TCD word 5, bits [30:25] are used to form a 15 bit biter
field.
else
After the "minor" loop is exhausted, the DMA engine
initiates a channel service request at the channel
defined by biter.linkch[5:0] by setting that channel’s
TCD.start bit.
biter[6:14]
Beginning “major” iteration count
The value contained in biter.linkch[5:0] must not
exceed the number of implemented channels.
This is the initial value copied into the citer field or
citer.linkch field when the major loop is completed.
The citer fields controls the iteration count and linking
during channel execution.
This 9- or 15-bit count represents the beginning major
loop count for the channel. As the major iteration
count is exhausted, the contents of the entire 16-bit
biter entry is reloaded into the 16-bit citer entry.
When the biter field is initially loaded by software, it
must be set to the same value as that contained in the
citer field.
If the channel is configured to execute a single
service request, the initial values of biter and citer
should be 0x0001.
15-36
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor