Chapter 14 Automatic Transfer Controller

14-3-16 Transfer Mode B

In transfer mode B, ATC1 automatically transfers one byte of data from any memory space to any other memory space every time an ATC1 activation request occurs.

Memory Pointer 0 00000 - 3FFFF

AT1MAP0

AT1MAP0 + 1

AT1MAP0 + 2

AT1MAP0 + 3

Memory Pointer 1 00000 - 3FFFF

AT1MAP1

AT1MAP1 + 1

AT1MAP1 + 2

AT1MAP1 + 3

Figure 14-3-13 Transfer Mode B

Set the source address in 18-bit memory pointer 1 (AT1MAP1H, M, L), and set the destination address in 18-bit memory pointer 0 (AT1MAP0H, M, L).

Transfer mode B 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.

Operation XIV - 29

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Panasonic F77G, MN101C77C user manual Transfer Mode B