Contec IPC Series Manual page 33

5 RAS Function Supplementary Information
Status register bit definition
Bit
0 Busy
1 Data Ready
DIR
2 0: Host →Microcomputer
1: Microcomputer→Host
3 -
4 -
5 -
6 -
7 -
This section describes the microcomputer's internal logical registers and how to issue commands.
How to issue commands from HOST
1. Confirm that Busy and Data Ready are set at 0, and set DIR to 0 and change Busy to 1.
2. Enter commands and data.
3. Change Busy to 0 and Data Ready to 1.
4. If a return value is not necessary, the next command can be executed when Busy and Data Ready
are both set at 0.
5. If a return value is necessary, wait for Busy to return to 0 and DIR and Data Ready to return to 1.
6. After the return value is read, change Data Ready to 0.
How to enter a return value from STM
1. Confirm that Busy and DIR are set at 0 and Data Ready is set at 1, and change Busy to 1.
2. Read the command, and if a return value is not necessary, change Data Ready and Busy to 0 after
the process has completed.
3. If a return value is necessary, change DIR to 1 and Data Ready to 0.
4. When the return value has been stored, set Data Ready to 1 and change Busy to 0.
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Meaning
BX-830 Ubuntu 14.04 Desktop 64bit Operational Check Manual