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3.
SPECIFICATIONS
3.5
Buffer Memory
The AlSD71 has a battery backed buffer memory for communication of data
with the AISCPU. The memory map is shown in Fig. 3 . 2 8 .
Data can be read from the buffer memory as follows:
1
Reading data using the
sequence program
One word
(16
bit) or two word data can be read by using the buffer
read application instructions.
1
Reading data using the peripheral device
Data can be read in the various modes of a peripheral device.
For details, refer to the SWOGP-A1 SD71 P Operating Manual.
Data can be written to the buffer memory as follows:
(The writing of data may be restricted depending on the status of the A I SD71.
General write conditions are shown in Fig. 3 . 2 8 . For further details, refer to
Section 3.5.1 to 3 . 5 . 5 . )
,
Writing data from the
sequence program
One word
(1 6
bit) or two word data can be written by using the buffer
write application instructions.
Writing data from the peripheral device
Data can be written by storing data to a memory area in the peripheral
device and transferring data in blocks from the peripheral device
to
the AlSD71 buffer memory.
Data writing by the peripheral device shown in Fig. 3.22 is valid when
the above-mentioned method is used.
An additional function allows individual pieces
of positioning data to be written
to the buffer memory if the AlSD71 is busy. For details, refer to the SWOGP-
AD71 P Operating Manual.
For buffer memory access instructions, refer to Chapter 6 'Programming.'
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