=> No entry conditions
<= R0 = Song Position Pointer
R1 bit 0 set if in External Timing Mode (start message has been received)
bit 1 set if in Internal Timing Mode (start message has been transmitted; Timing Clock transmission is automatic)
bit 2 set if in Fast Clock Mode
bit 3 set if MIDI_FastClock has been called. This flag is only reset on Ctrl-Break, *RMReInit MIDI or MIDI_Init with R0 = 0.
bit 4 set if in special mode to store System Real Time Messages in receive buffer.
bit 5 set if in special mode to cause System Real Time Messages not to be treated specially.
Bits 0 and 1 are determined by the current timing mode.
Bits 2 and 3 are set by calling MIDI_FastClock with the relevant parameters.
Bits 4 and 5 are set by calling MIDI_Init with bits 30 and 31 of R1 set.
Returns the value of the internal Song Position Pointer. This is the value of the MIDI beat counter divided by six.
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