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| 型號(hào)： | M37902FGCGP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| 中文描述： | 單片16位CMOS微機(jī) |
| 文件頁(yè)數(shù)： | 99/143頁(yè) |
| 文件大小： | 1463K |
| 代理商： | M37902FGCGP |
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M37902FCCHP, M37902FGCHP, M37902FJCHP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
Fig 103. Block diagram of debug function
Address compare register 0
Address compare register 1
Debug control register 0
Matching
Compare register
Matching
Compare register
Address matching
detect circuit
Debug control register 1
Internal data bus (DB
0 to
DB
15
)
CPU bus (Address)
Address matching
detection interrupt
DEBUG FUNCTION
When the CPU fetches an instruction code, an interrupt request will
be generated if a selected condition is satisfied, as a resultant of
comparison between a specified address and the start address
where the instruction code is stored (the contents of PG and PC).
The decision whether this condition is satisfied or not is called ad-
dress matching detection, and the interrupt generated by this detec-
tion is called an address matching detection interrupt. (For interrupt
vector addresses, refer to the section on interrupts.)
In the address matching detection, a non-maskable interrupt routine
is proceeded without execution of the original instruction which has
been allocated to the target address.
The debug function provides the following two modes:
the address matching detection mode, which is used to avoid the
area where program exists or modify a program.
the out-of-address-area detection mode, which is used to detect a
program runaway.
Figures 103 shows the block diagram of the debug function. Figures
104 and 105 show the bit configurations of the debug control regis-
ters 0, 1, and address compare registers 0,1, respectively.
The detect condition select bits of the debug control register 0 can
select one condition between the following 4 conditions. When the
selected address condition is satisfied, an address matching detec-
tion interrupt request will be generated:
(1) Address matching detection 0
The contents of PG and PC match with the address which has
been set in the address compare register 0.
(2) Address matching detection 1
The contents of PG and PC match with the address which has
been set in the address compare register 1.
(3) Address matching detection 2
The contents of PG and PC match with the address which has
been set in either of the address compare register 0 or address
compare register 1.
(4) Out-of-address-area detection
The contents of PG and PC are less than the address which has
been set in the address compare register 0 or larger than the ad-
dress which has been set in the address compare register 1.
By setting the detect enable bit of the debug control register 0 to
“
1
”
,
an address matching detection interrupt request will be generated if
any one of the above address conditions is satisfied. Clearing the
detect enable bit to
“
0
”
generates no interrupt request even if any of
the above address conditions is satisfied.
The address compare register access enable bit of the debug con-
trol register 1 must be set to
“
1
”
by the instruction just before the ac-
cess operation (read/write). Then, this bit must be cleared to
“
0
”
(disabled) by the next instruction. While this bit =
“
0
”
, the address
compare registers 0, 1 cannot be accessed.
The address-matching-detection 2 decision bit of the debug control
register 1 decides, whether the address which has been set in the
address compare register 0 or 1 matches with the contents of PG,
PC, when the address matching detection 2 is selected. The con-
tents of this bit is invalid when address matching detection 0 or 1 is
selected.
In order to use the debug function to avoid the area where program
exists or modify a program, perform the necessary processing within
an address matching interrupt routine. As a result, the contents of
PG, PC, PS at acceptance of an address matching detection inter-
rupt request (i.e. the address at which an address matching detec-
tion condition is satisfied) have been pushed on to the stack. If a
return destination address after the interrupt processing is to be al-
tered, rewrite the contents of the stack, and then return by the RTI
instruction.
To use the debug function to detect a program runaway, set an ad-
dress area where no program exists into the address compare regis-
ters 0 and 1 by using the out-of-address-area detection. When the
CPU fetches instruction codes from this address area and executes
them, an address matching detection interrupt request will be gener-
ated.
The above debug function cannot be evaluated by a debugger, so
that the debug function must not be used while a debugger is run-
ning.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M37902FCCHP | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37902FGCHP | DIODE SCHOTTKY DUAL COMMON-ANODE 25V 150mW 0.32V-vf 200mA-IFM 1mA-IF 2uA-IR SOT-523 3K/REEL |
| M37902FJCHP | SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37905F8CFP | 16-BIT CMOS MICROCOMPUTER |
| M37905F8CSP | 16-BIT CMOS MICROCOMPUTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M37902FGCHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37902FJCHP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER |
| M37903S4CHP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:16-BIT CMOS MICROCOMPUTER |
| M37905F8CFP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16-BIT CMOS MICROCOMPUTER |
| M37905F8CSP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:16-BIT CMOS MICROCOMPUTER |
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