Panasonic MN101C77C User Manual

Operation

Chapter 14    Automatic Transfer Controller

XIV - 15

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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)

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.