32186 datasheet(790/1032 Pages) RENESAS

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REAL TIME DEBUGGER (RTD)

15-4

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

Figure 15.4.1 RDR Command Data Format

19 18 17 16

A15

A14

14 13 12

A16

A17

A28

A29

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.")

RTDRXD

(MSB side)

(LSB side)

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

Command

b19

b18

b17

b16

Mnemonic

RTD Function

0000

VER (VERify)

Continuous monitor

0100

0101

0110

VEI (VErify Interrupt request)

RTD interrupt request

0010

RDR (ReaD RAM)

Real-time RAM content output

0011

WRR (WRite RAM)

RAM content forcible rewrite (with verify)

1111

RCV (ReCoVer)

Recover from runaway condition (Note 2), (Note 3)

0001

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.

15.4 Functional Description of RTD

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