Renesas M32R/ECU Series User Manual page 645

14
14.1 Outline of the Real-Time Debugger (RTD)
The Real-Time Debugger (RTD) is a serial I/O through which to read or write to any location in the entire area of
the internal RAM by using commands from outside the microcomputer. Because data transfers between the RTD
and internal RAM are performed via a dedicated internal bus independently of the M32R-FPU, RTD operation can
be controlled without the need to stop the M32R-FPU.
Table 14.1.1 Outline of the Real-Time Debugger (RTD)
Item
Transfer method
Generation of transfer clock
RAM access area
Transmit/receive data length
Bit transfer sequence
Maximum transfer rate
Input/output pins
Number of commands
CPU
Address Data
Figure 14.1.1 Block Diagram of the Real-Time Debugger (RTD)
14.1 Outline of the Real-Time Debugger (RTD)
Description
Clock-synchronous serial I/O
Generated by external host
Entire area of the internal RAM (controlled by A16–A29)
32 bits (fixed)
LSB first
2 Mbits/second
4 pins (RTDTXD, RTDRXD, RTDACK, RTDCLK)
Following five functions
• Monitor continuously
• Output real-time RAM content
• Forcibly rewrite RAM content (with verify)
• Recover from runaway condition
• Request RTD interrupt
Entire RAM area
Address Data
Bus Switching Circuit
14-2
REAL TIME DEBUGGER (RTD)
RTD Control Circuit
Control Circuit
Commands
Address
Data
Data
32180 Group User's Manual (Rev.1.0)
RTDCLK RTDCLK
RTDACK
RTDTXD
RTDRXD