Appendix DData Areas
578
Dedicated Bits
Some of the bits in the CPU Bus Link Area and most of the bits in the Auxiliary Area and are dedicated for
specific purposes. These are summarized in the following tables. Refer to
3-5 CPU Bus Link Area
and
3-6
Auxiliary Area
for details.
CPU Bus Link Area
Most CPU Bus Link Area bits are in the Data Link Area, used to transfer information between the CPU and
CPU Bus Units, but G000 contains flags and control bits relating to PC status and G001 to G004 is the Clock/
Calendar Area.
Word(s) Bit(s) Function
G000 00 ON when the PC is in PROGRAM mode.
01 ON when the PC is in Debug mode.
02 ON when the PC is in MONITOR mode.
03 ON when the PC is in RUN mode.
04 ON when the program is being executed.
05 Not used.
06 ON when a non-fatal error has occured. (PC operation continues.)
07 ON when a fatal error has occured. (PC stops.)
08 to 10 Not used.
11 UM Protect Bit. Prevents both reading out and writing to Program Memory when turned ON.
Set with the CVSS.
12 Memory Card Protect Bit. Prevents writing to Memory Card when turned ON. Set with the
Memory Card Protect Switch.
13 and 14 Not used.
15 UM Protect Bit. Prevents writing to Program Memory when turned ON. Set with the System
Protect Key Switch.
G 001 00 to 07 Seconds (00 to 59)
08 to 15 Minutes (00 to 59)
G 002 00 to 07 Hours (00 to 23)
08 to 15 Day of month (01 to 31)
G 003 00 to 07 Month (1 to 12)
08 to 15 Year (00 to 99)
G 004 00 to 07 Day of week (00 to 06, 00 = Sun.)
To Next Page
Loading...
