BIT MAP OF REGISTER CRB
REG
# NAME ALARM INMODE LOAD RUNMODE OUTMODE PBON START
F CRB 0=TOD 00-02 1=force 0=cont. 0=pulse 0=PB70FF 0=stop
1=Alarm 01=CNT load 1=one- 1=toggle 1=PB70N 1=start
10=Timer A (strobe) shot
11=CNT+
Timer A
<--------------Timer B Variables---------------->
All unused register bits are unaffected by a write and forced to 0 on a
read.
PORT SIGNAL ASSIGNMENTS
This part specifies how various signals relate to the available ports of
the 8520. This information enables the programmer to relate the port
addresses to the outside-world items (or internal control signals) which
are to be affected. This part is primarily for the use of the systems
programmer and should generally not be used by applications programmers.
Systems software normally is conFigured to handle the setting of
particular signals, no matter how the physical connections may change.
NOTE
In a multi-tasking operating system, many different tasks may be
competing for the use of the system resources. Applications programmers
should follow the established rules for resource access in order to
assure compatibility of their software with the system.
- Appendix F 329 -
To Next Page
Loading...
