m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 387

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

detection interrupt request if a selected condition is satisfied as a result of comparison between the address
where the op code to be fetched is stored (in other words, the contents of PG and PC) and the specified
address.
interrupt, refer to “CHAPTER 6. INTERRUPTS.”
using the debug function.
described in the following.
DEBUG FUNCTION
17.1 Overview, 17.2 Block description
17.1 Overview
When the CPU fetches an op code (op-code fetch), the debug function generates an address matching
The debug function provides the following 2 modes:
Note that an address matching detection interrupt is a non-maskable software interrupt. For details of this
In addition, the debug function cannot be evaluated by a debugger. Therefore, do not use a debugger when
17.2 Block description
Figure 17.2.1 shows the block diagram of the debug function, and the registers relevant to this function are
Fig. 17.2.1 Block diagram of debug function
17-2
(1) Address matching detection mode
(2) Out-of-address-area detection mode
When the contents of PG and PC match with the specified address, an address matching detection
interrupt request occurs. This mode can be used for avoiding or modifying a portion of a program.
When the contents of PG and PC go out of the specified area, an address matching detection interrupt
request occurs. This mode can be used for the program runaway detection by specifying the area
where a program exists.
Matching • Compare register
Address compare register 0
Internal data bus (DB
Matching • Compare register
Address compare register 1
CPU bus (Address)
7905 Group User’s Manual Rev.1.0
0 to
DB
15
)
Debug control register 0
Debug control register 1
Address matching
detect circuit
Address matching
detection interrupt