Fifo - NXP Semiconductors MC9S08SU16 Reference Manual

Functional description
The four control bits DBG_T[BEGIN] and DBG_T[TRGSEL], and DBG_C[BRKEN]
and DBG_C[TAG], determine the basic type of debug run as shown in the following
table. Some of the 16 possible combinations are not used (refer to the notes at the end of
the table).
BEGIN
0
0
0
0
0
0
1
1
1
1
1
1
572
Table 28-1. Basic types of debug runs
TRGSEL BRKEN
0
0
0
1
1
1
0
0
0
1
1
1
MC9S08SU16 Reference Manual, Rev. 5, 4/2017
TAG
0 x
1 0
1 1
0 x
1 0
1 1
0 x
1 0
1 1
0 x
1 0
1 1
Type of debug run
Fill FIFO until trigger
address (no CPU
breakpoint - keep
running)
Fill FIFO until trigger
address, then force
CPU breakpoint
Do not use
Fill FIFO until trigger
opcode about to
execute (no CPU
breakpoint - keep
running)
Fill FIFO until trigger
opcode about to
execute (trigger causes
CPU breakpoint)
Start FIFO at trigger
address (No CPU
breakpoint - keep
running)
Start FIFO at trigger
address, force CPU
breakpoint when FIFO
full
Start FIFO at trigger
opcode (No CPU
breakpoint - keep
running)
Start FIFO at trigger
opcode, force CPU
breakpoint when FIFO
full
NXP Semiconductors