TPU Problem

Hi All

I am having problems testing out a few VERY basic TPU functions on my 
MPC555. I have written 2 custom TPU functions but whenever I enable 
the channel running my second function the whole TPU appears 
to 'hang'.

My first function is a simple square wave generator and this works 
fine. My second function was to be a channel that detected any 
transition in the input pin and then link to another channel to carry 
out some other function. But I have not got that far yet!

I have assigned my square wave function (function 14) to channel 0 
and set this as high priority. I then assigned my transition detect 
function (function 15) to channel 1, however as soon as I enable the 
channel 1 by setting it's priority to high (I have also tried low) 
then my square wave function on channel 0 no longer outputs a square 
wave. Even if I then subsequently disable channel 1 by setting 
priority to 0, the channel 0 function still does not work.

I have run both functions on the Ashware simulator and they both run 
with no problems.

Note that I am running the TPU3 in TPU1 mode.

I am sure I am doing something very silly but I am new to this stuff 
and I just can't see what! 

Below I copy my code for function that 'hangs' the tpu. I hope you 
can help me solve this.

Many thanks

Steve

CODE FOLLOWS:

%macro MSR_PERIOD	'prm3'.

%entry name = INIT_MES; start_address *; disable_match;
cond hsr1=1, hsr0=1, lsr=x, m/tsr=x, pin=x, flag0=x.

	chan	TBS := in_m1_c1,
			PAC := any_trans,
			enable_mtsr.
	chan	neg_mrl, neg_tdl, neg_lsl;
			end.

%entry name = TRANS_MES; start_address *; disable_match;
cond hsr1=0, hsr0=0, m/tsr=1, lsr=x, pin=x, flag0=x;
ram p <- @MSR_PERIOD.

	au 		diob := ert;
	chan	neg_tdl;
(*	ram		diob -> @MSR_PERIOD;*)
(*	au		link := #$10;*)
		end.

(*********************************************************************
*)
(* UNUSED ENTRIES  - execute an end       1 & 2 were 
END_OF_PHASE                            *)
(*********************************************************************
*)
%entry  name = MESSAGE_UNUSED;
	start_address END_OF_LINK;
	cond hsr1 = 0, hsr0 = 1,lsr=x, m/tsr=x, pin=x, flag0=x.

%entry  name = MESSAGE_UNUSED;
	start_address END_OF_LINK;
	cond hsr1 = 1, hsr0 = 0, lsr=x, m/tsr=x, pin=x, flag0=x.

%entry  name = MESSAGE_UNUSED;
	start_address END_OF_LINK;
	cond hsr1 = 0,hsr0 = 0,m/tsr = 0,lsr =1, pin=x, flag0=x.






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