Sharp LH79524 - Table 5-27. TCNT Register; Table 5-28. TCNT Fields; Terminal Count Register (TCNT)

Direct Memory Access Controller LH79524/LH79525 User’s Guide
5-14 Version 1.0
5.2.2.7 Terminal Count Register (TCNT)
The Terminal Count Register is a 16-bit Read Only register that contains the number of
data units remaining in the current DMA transfer. The data unit is equal to the source-to-
DMA data width (byte, half-word or word).
The register value is decremented every time data transfers to the DMA FIFO. When the
terminal count reaches zero, the FIFO content transfers to the destination and a DMA
transfer is finished.
Table 5-27. TCNT Register
BIT 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FIELD ///
RESET 0000000000000000
RW RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO
BIT 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIELD TERM
RESET 0000000000000000
RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW
ADDR DATASTREAM x BASE + 0x028
Table 5-28. TCNT Fields
BITS NAME DESCRIPTION
31:16 /// Reserved Reading returns 0. Write the reset value.
15:0 TERM
Terminal Count This field contains the number of data units remaining in
the current DMA transfer. The data unit is the source-to-DMA data width (byte,
half-word or word).