Table 5-12. Max Register; Table 5-13. Max Fields; Maximum Count Register (Max) - Sharp LH79524 User Manual

Direct Memory Access Controller

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
BIT
FIELD
RESET
RW
BIT
FIELD
RESET
RW
ADDR
BITS
31:16
15:0
5-8
31 30 29 28 27
0 0 0 0 0
RO RO RO RO RO
15 14 13 12 11
0 0 0 0 0
RW RW RW RW RW
NAME
/// Reserved Reading returns 0. Write the reset value.
MAXCOUNT Maximum Count This field contains the maximum data unit count.

Table 5-12. MAX Register

26 25 24 23
///
0 0 0 0
RO RO RO RO
10 9 8 7
MAXCOUNT
0 0 0 0
RW RW RW RW
DATASTREAM x BASE + 0x010

Table 5-13. MAX Fields

DESCRIPTION
Version 1.0
LH79524/LH79525 User's Guide
16
– 1).
22 21 20 19 18
0 0 0 0 0
RO RO RO RO RO
6 5 4 3 2
0 0 0 0 0
RW RW RW RW RW
17 16
0 0
RO RO
1 0
0 0
RW RW