32186 datasheet(788/1032 Pages) RENESAS

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REAL TIME DEBUGGER (RTD)

15-2

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

15.1 Outline of Real-Time Debugger (RTD)

The Real-Time Debugger (RTD) is a serial interface 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 15.1.1 Outline of the Real-Time Debugger (RTD)

Item

Description

Transfer method

Clock-synchronous serial interface

Generation of transfer clockGenerated by external host

RAM access area

Entire area of the internal RAM (controlled by A14–A29)

Transmit/receive data length

32 bits (fixed)

Bit transfer sequence

LSB first

Maximum transfer rate

2 Mbits/second

Input/output pins

4 pins (RTDTXD, RTDRXD, RTDACK, RTDCLK)

Number of commands

Following five functions

• Monitor continuously

• Output real-time RAM content

• Forcibly rewrite RAM content (with verify)

• Recover from runaway condition

• Request RTD interrupt

Figure 15.1.1 Block Diagram of the Real-Time Debugger (RTD)

15.1 Outline of Real-Time Debugger (RTD)

Control Circuit

Commands

Data

Address

Data

RTD Control Circuit

Entire Area of

Internal RAM

M32R-FPU

Core

Address

Data

Bus Switching Circuit

RTDCLK

RTDACK

RTDTXD

RTDRXD

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