User`s manual

7Windows/Dialogs
175
7.12.7 Display of bus information on the M16C/R8C Debugger
From left to right, the contents are as follows:
• Address
The status of the address bus
• Data
The status of the data bus
• BUS
The width of the external data bus ("8b" for an 8-bit data bus, and "16b" for a 16-bit data bus)
• BIU
This shows the status between the BIU (bus interface unit) and memory, and BIU and I/O.
Display format
Status
- No change
IN T Start of INTACK sequence
IB Instruction code read due to CPU cau e (bytes) s
DB Data access due to CPU cause (bytes)
IW Instruction code read due to CPU caus (words) e
DW Data access due to CPU cause (words)
DMA Data access other than a CPU cause such as DMA
EMA Data access due to the emulator system
• R/W
Shows the status of the data bus ("R" for read, "W" for write, "-" for no access).
• RWT
This signal shows the effective position in the bus cycle ("0" when effective. Address, Data, and
BIU signals are valid when RWT is "0".
• CPU
Shows the status between CPU and BIU (bus interface unit )
Display format
Status
- No change
CB Operation code read (bytes)
RB Operand read (bytes)
QC Instruction queue buffer clea r
CW Operation code read (words)
RW Operand read (words)
• QN
Shows the number of bytes stored in the instruction queue buffer in the range 0 to 4.
• 76543210
Shows the status of the 8-bit external signal (pins EXTIN0 to EXTIN7 of the external trace signal
input cable). High level = "1", Low level = "0".
• h" m' s: ms.us
Show the elapsed time from the target program beginning.