Renesas M16C/30P User Manual page 68

M3062PT2-EPB User's Manual
2. Trace window (Bus display)
3. Trace window (Disassemble display)
4. Trace window (Source display)
REJ10J0868-0200 Rev.2.00 January 16, 2006
3. Usage (How to Use the Emulator Debugger)
Explanation of the trace window (bus display)
The following explains the displayed contents, from left to right.
- Address
Shows the status of the address bus.
- Data
Shows the status of the data bus.
- BUS
Shows the width of the external data bus. In the present
emulator, "16b" for 16 bits wide bus and "8b" for 8 bits wide
bus are displayed.
- BHE
Shows the status (0 or 1) of the BHE (Byte High Enable)
signal. If this signal = 0, the odd-address data is valid.
- BIU
Shows the status between the BIU (Bus Interface Unit) and
memory or I/O.
Symbol Status
- : No change
DMA : Data access except for CPU
INT : Starts INTACK sequence
IB : Instruction code read (bytes) by CPU
DB : Data access (bytes) by CPU
IW : Instruction code read (words) by CPU
DW : Data access (words) by CPU
- R/W
Shows the status of the data bus. Displayed as "R" for Read,
"W" for Write, and "–" for no access.
- RWT
This is the signal to indicate a valid bus cycle. When valid,
RWT = 0. The Address, Data, and the BIU signals are effective
when this signal is 0.
- CPU
Shows the status between the CPU and BIU (Bus Interface
Unit).
Symbol Status
CB : Op-code read (bytes)
RB : Operand read (bytes)
QC : Clears instruction queue buffer
CW : Op-code read (words)
RW : Operand read (words)
- QN
Shows the byte count stored in the instruction queue buffer.
The display range is 0 to 4.
- 76543210
Shows the level of external trace signal input cable EXTIN0 to
EXTIN7.
- h" m' s: ms. us
Shows the elapsed time after starting the user program.
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