26.4.3.1 Internal Control Register Visibility

For debugging purposes, some registers internal to the PTG can be read by the user during PTG operation. When PTGSTRT = 0, a read of any PTG Control register will return the value last written to it. However, when PTGSTRT is set to ‘1’, the values stored in the PTGTxLIM, PTGCxLIM, PTGSDLIM, PTGL0 and PTGQPTR registers are transferred to internal registers, and the user-accessible registers become read-only. Subsequent reads of these registers, as long as PTGSTRT = 1, and for the Timer/Counter registers, PTGIVIS = 0, return the internal register values, which may be modified by step commands.