SH7058 Datasheet, PDF (774/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

Pin Functions in RAM Monitor Mode
Pin
AUDCK
AUDSYNC
AUDATA3 to
AUDATA0
Description
The external clock input pin. Input the clock to be used for debugging to this pin.
The input frequency must not exceed 10 MHz. When no connection is made, this
pin is pulled up internally.
Do not assert this pin until a command is input to AUDATA from off-chip and the
necessary data can be prepared. See the protocol description for details. When
no connection is made, this pin is pulled up internally.
When a command is input from off-chip, data is output after Ready reception.
Output starts when AUDSYNC is negated. See the protocol description for
details. When no connections are made, these pins are pulled up internally.
20.3 Branch Trace Mode
20.3.1 Overview
In this mode, the branch destination address is output when a branch occurs in the user program.
Branches may be caused by branch instruction execution or interrupt/exception processing, but no
distinction is made between the two in this mode.
20.3.2 Operation
Operation starts in branch trace mode when AUDRST is asserted, AUDMD is driven low, then
AUDRST is negated.
Figure 20.2 shows an example of data output.
While the user program is being executed without branches, the AUDATA pins constantly output
0011 in synchronization with AUDCK.
When a branch occurs, after execution starts at the branch destination address in the PC, the
previous fully output address (i.e. for which output was not interrupted by the occurrence of
another branch) is compared with the current branch address, and depending on the result,
AUDSYNC is asserted and the branch destination address output after 1-clock output of 1000 (in
the case of 4-bit output), 1001 (8-bit output), 1010 (16-bit output), or 1011 (32-bit output). The
initial value of the compared address is H'00000000.
On completion of the cycle in which the address is output, AUDSYNC is negated and 0011 is
output from the AUDATA pins.
Rev. 3.0, 09/04, page 733 of 1086