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ZBasic Language Reference
69
ZX Microcontroller Family
Register.RTCTickFrequency
This read-only UnsignedInteger value indicates the number of RTC ticks that will occur per second.
For most ZX models currently available, the RTC tick frequency is 512Hz.
Register.RTCTimerFrequency
This read-only UnsignedLong value indicates the frequency at which the TCNT register of the RTC
timer changes value. For most ZX models currently available, the RTC timer frequency is 230,400Hz.
This value will be useful for converting value returned by GetElapsedMicroTime() to seconds.
Register.CPUFrequency
This read-only UnsignedLong value indicates the frequency of the CPU clock, in Hertz. For most ZX
models currently available, the CPU frequency is 14,745,600Hz.
Register.SeedPRNG
This register, having type Long, represents the “seed” value used by the built-in pseudo-random number
generator. With a given seed value, the random number generator will always return the same sequence
of values. Usually, you wouldn’t want this type of repeatability but for some purposes it is useful. See the
descriptions for the System Library routines Rnd() and Randomize() for more details.
Register.Timer0Busy
Register.Timer1Busy
Register.Timer2Busy
Register.Timer3Busy
Register.Timer4Busy
Register.Timer5Busy
Register.TimerIOBusy
Register.TimerUARTBusy
These Boolean values indicate when the processor’s built-in timers are being used. Your code can pass
one of these register values as the parameter to the Semaphore() function in order to get exclusive
access to the corresponding timer. The last two entries are synonyms for one of the earlier entries. This
is useful because the actual timer used, for example, for timing I/O functions varies amongst ZX devices.
See Section 3.7 for more information on Timer use.
Register.TimerSpeed1
Register.TimerSpeed2
These two registers, both Byte values, represent the timer pre-scaler value used by several System
Library routines for the I/O Timer. Setting the value of these registers other than by direct assignment will
produce undefined results. See Section 3.7 for more information on Timer use.
Register.TaskStackMain
Register.TaskStackCurrent
These UnsignedInteger values represent the address of the task stack for the Main() task and the
current task, respectively. The value, which is read-only, can be passed to the various task management
functions by using the System Library function CByteArray(). See Section 3.28 for more details on
Task Management.
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