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Chapter 14 Automatic Transfer Controller
Operation
XIV - 14
Set the source address in 18-bit memory pointer 0 (AT1MAP0H, M, L), and set the destination I/O
address in lower 8 bits of memory pointer 1(AT1MAP1L). The upper 10 bits of the I/O space address
(x'03F') need not to be set in AT1MAP1H and AT1MAP1M.
Transfer mode 0 does not have an incrementing function for the memory pointers. The data transfer
executes for a fixed address.
Set the data transfer count for ATC1 in the transfer data counter (AT1TRC). The counter can be set to
a maximum of 255 transfers. The counter decrements each time ATC1 is activated. When it reaches
x'00', an interrupt (ATC1IRQ) occurs and the automatic transfer ends.
14-3-5 Transfer Mode 0
In transfer mode 0, ATC1 automatically transfers one byte of data from any memory space to the I/O space
(special registers : x'03F00' - x'03FFF') every time an ATC1 activation request occurs.
AT1MAP0
AT1MAP0 + 1
AT1MAP0 + 2
AT1MAP0 + 3
AT1MAP1
Memory Pointer 0
00000 - 3FFFF 03F00 - 03FFF
Memory Pointer 1
(Only lower
8 bits are valid)
Figure 14-3-2 Transfer Mode 0