Mitsubishi Q2ACPU, User Manual

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DATA COMMUNICATIONS WITH SPECIAL FUNCTION MODULES
6 DATA COMMUNICATIONS WITH SPECIAL FUNCTION MODULES
This chapter explains the methods for reading data from a special function module, and
writing data to a special function module with the QnACPU.
The special function module is a module that allows analog quantity, high-speed pulse,
etc., which cannot be processed with I/O module alone, to be handled by the QnACPU.
For example, analog quantity is converted to a digital value by an analog/digital converter
module (which is a special function module) so that they can be used by the QnACPU.
The special function module has buffer memory in which data input from external sources
and data to be output to external destinations are stored.
The folloiwng two methods are available for reading data from a special function module,
and writing data to a special function module with the QnACPU.
1) Using the FROM/TO instruction
2) Using special direct devices
These methods are explained in the following sections.