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Operation
Chapter 14 Automatic Transfer Controller
XIV - 15
13
Set the source I/O address in lower 8 bits of memory pointer 1 (AT1MAP1L), and set the destination
address in 18-bit memory pointer 0 (AT1MAP0H, M, L). The upper 10 bits of the I/O space address
(x'03F') need not to be set in AT1MAP1H and AT1MAP1M.
Transfer mode 1 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.
AT1MAP0
AT1MAP0 + 1
AT1MAP0 + 2
AT1MAP0 + 3
AT1MAP1
Memory Pointer 0
00000 - 3FFFF
03F00 - 03FFF
Memory Pointer 1
(Only lower
8 bits are valid)
14-3-6 Transfer Mode 1
In transfer mode 1, ATC1 automatically transfers one byte of data from the I/O space (special registers :
x'03F00' - x'03FFF') to any memory space every time an ATC1 activation request occurs.
Figure 14-3-3 Transfer Mode 1