Renesas M16C FAMILY Manual De Usuario

5 Using the KD 

The clock synchronous serial I/O is used for FoUSB and the monitor program 

communication. When the data is received, the DBC interrupt generates and the monitor 

program is executed. The DBC interrupt is not influenced of I flag. (The receive interrupt 

is used for some models because there is no DBC interrupt. In this case, the DBC 

interrupt is influenced of I flag). The monitor program analyzes the received data and 

executes each command. 

1) User Program exection 

A User Program is executed in the following procedure. 

(1) An address match interrupt is disabled. 

(2) One instruction of a User Program is executed (using a single step interrupt and 

executing only one instruction) and go back to the monitor program. 

(3) When a software break is set, enable an address match interrupt. 

(4) The User Program continuance is executed. 

When a User Program is stopped by a software break, if a User Program is 

executed, an address match interrupt is generated and stops in the same 

address again, therefore to move from the address is not possible. Above (1) to 

(3) processes are performed to avoid this re-interrupt. 

2) Software break 

An address match interrupt is used for software break. When an address match 

interrupt is generated, a monitor program is operated. The number of the software 

breaks which can be used simultaneously is the same as the number of the address 

match functions which are built in a microcomputer. 

3) Step Execution 

A single step interrupt is used for step execution.    When a single step interrupt is 

generated, a monitor program is operated.  Step execution has step, over and 

return. 

4) Dump 

When using dump, a User Program execution is stopped temporarily, and the data       

of the area currently opened in the dump window is transferred.  A monitor     

program is used for a register regarding a clock, therefore these registers may be 

the values which the user doesn't set up. 

 

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