SEGA SATURN DEVELOPER'S MANUAL

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2.5 RTC command

Shows details of RTC command in table format.
The following is a list of commands and notes. In addition, by using the status flag in all commands, you can manage the double issue of commands.

SMPC interrupt
If it is described as “occurrence”, an SMPC interrupt will be generated to SH-2 via SCU at the end of the command. The interrupt can be enabled / disabled by setting the SCU.
IREG, OREG
Details of IREG and OREG used in
- command.
  The
- command parameter is set to IREG before issuing the command.
  The
- result parameter is a parameter that is set to OREG by command execution.
  The
- result parameter OREG31 is set when SMPC starts command processing. The command code is output to OREG31. By using it together with the status flag (SF),
  Can be judged.
Runtime
The execution time calculated from the number of SMPC internal firmware steps is shown. The command execution time changes when it collides with an internal task such as RTC increment, so it is described in the range between the minimum and maximum values.

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