Sharp LH79524 - Maximum Count Register (MAX); Table 5-12. MAX Register; Table 5-13. MAX Fields

Direct Memory Access Controller LH79524/LH79525 User’s Guide
5-8 Version 1.0
5.2.2.3 Maximum Count Register (MAX)
The Maximum Count Register must be programmed with the maximum number of data
units of the next DMA transfer. A data unit equals the source-to-DMA data width (byte, half-
word or word). When the DMA Controller is enabled, the content of the Maximum Count
Register loads into the Terminal Count Register.
If the maximum count is programmed to 1, the DMA Controller performs a single transfer
only and sets the terminal count. If the maximum count is programmed to 0, the DMA Con-
troller does not perform any function.
The maximum terminal count is limited by a 16-bit value. (2
16
– 1).
Table 5-12. MAX 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 MAXCOUNT
RESET 0000000000000000
RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW
ADDR DATASTREAM x BASE + 0x010
Table 5-13. MAX Fields
BITS NAME DESCRIPTION
31:16 /// Reserved Reading returns 0. Write the reset value.
15:0 MAXCOUNT Maximum Count This field contains the maximum data unit count.