32185 Datasheet, PDF (790/1032 Pages) Renesas Technology Corp – MCU

15
REAL TIME DEBUGGER (RTD)
15.4 Functional Description of RTD
15.4 Functional Description of RTD
15.4.1 Outline of RTD Operation
Operation of the RTD is specified by a command entered from devices external to the chip. A command is
indicated by bits 16–19 (Note 1) of the RTD received data.
Table 15.4.1 RTD Commands
RTD Received Data
b19 b18 b17 b16
0
0
0
0
0
1
0
0
0
1
0
1
Command
Mnemonic
VER (VERify)
RTD Function
Continuous monitor
0
1
1
0
VEI (VErify Interrupt request) RTD interrupt request
0
0
1
0
RDR (ReaD RAM)
Real-time RAM content output
0
0
1
1
WRR (WRite RAM)
RAM content forcible rewrite (with verify)
1
1
1
1
RCV (ReCoVer)
Recover from runaway condition (Note 2), (Note 3)
0
0
0
1
System reserved (use inhibited)
↑ (Note 1)
Note 1: The RTD received data bit 19 actually is not stored in the command register, and except for the RCV
command, handled as a “Don’t care” bit. (Bits 16–18 are effective for the command specified.)
Note 2: The RCV command must always be transmitted twice in succession.
Note 3: For the RCV command, all bits, not just 16–19, (i.e., bits 0–15 and bits 20–31) must be set to "1."
15.4.2 Operation of RDR (Real-time RAM Content Output)
When the RDR (real-time RAM content output) command is issued, the RTD is enabled to transfer the
contents of the internal RAM to external devices without causing the CPU’s internal bus to stop. Be-
cause the RTD reads data from the internal RAM while there are no transfers performed between the
CPU and internal RAM, no extra CPU load is incurred.
Only the 32-bit word-aligned addresses(The lower address B’00) can be specified for read from the
internal RAM. (The two low-order address bits specified by a command are ignored.) Data are read out
and transferred from the internal RAM in 32-bit units.
RTDRXD
(LSB side)
31
X
20 19 18 17 16 15 14 13 12
X 0 0 1 0 A15 A14 A29 A28
(MSB side)
10
A17 A16
Command (RDR)
Specified address
Note: • X = Don't care.
(However, if issued immediately after the RCV command, bits 20-31 must all be set to "1.")
Figure 15.4.1 RDR Command Data Format
32185/32186 Group Hardware Manual
Rev.1.10 REJ09B0235-0110 May 15, 07
15-4