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14
14.3 Functional Description of the RTD
14.3.1 Outline of RTD Operation
Operation of the RTD is specified by a command entered from devices external to the chip. A
command is specified in bits 16-19(note 1) of the RTD receive data.
Table 14.3.1 RTD Commands
RTD Receive Data
b19 b18 b17 b16
0
0
0
0
0
1
0
0
0
1
0
1
0
1
1
0
0
0
1
0
0
0
1
1
1
1
1
1
0
0
0
1
↑ (Note 1)
Note 1 : Bit 19 of RTD receive data is not actually stored in the command register and except for the RCV
command, is handled as "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 bits 16-19, (i.e., bits 0-15 and bits 20-31) must be set to 1.
Command Mnemonic
VER (VERify)
VEI (VErify Interrupt request)
RDR (ReaD RAM)
WRR (WRite RAM)
RCV (ReCoVer)
System reserved (use inhibited)
14-4
REAL-TIME DEBUGGER (RTD)
14.3 Functional Description of the RTD
RTD Function
Continuous monitor
RTD interrupt request
Real-time RAM content output
RAM content forcibly rewrite (with verify)
Recover from runaway
(Note 2, Note 3)
Ver.0.10
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