Renesas R8C/Tiny Series Bedienungsanleitung PDF herunterladen (Seite 20)

5.3. Area in which user program can be downloaded

As shown in Figure 3 and Figure 4, a part of RAM or Flash Memory is used for the monitor

program when using the R8C UART debugger. The R8C UART debugger does not

download the user program in the area which overlaps with a monitor program when a user

program overlaps with a monitor program. Note that the R8C UART debugger does not

perform an error output at this time.

5.4. Frequency characteristics

The monitor program operates in the range of the main clock (Xin) frequency which is

shown below. Use an oscillator which has this range of the frequency since the monitor

program may not operate with the frequency other than the following.

1MHz (Min.) to 20MHz (Max.)

Table 3 lists each frequency and communication available speed. However, note that

operation may not be performed when dividing the main clock and using it with 1MHz or

below even in the range of frequency shown above.

Table 3 Communication Available Speed of Each Frequency

Communication Speed (bps) Frequency

1200 2400 4800 9600 19200 38400

20MHz N/A N/A

√ √ √ √

16MHz N/A N/A

√ √ √ √

14MHz N/A N/A

√ √ √ √

12MHz N/A N/A

√ √ √ √

10MHz N/A

√ √ √ √ √

8MHz N/A

√ √ √ √ √

6MHz N/A

√ √ √ √ √

4MHz

√ √ √ √ √

N/A

2MHz

√ √ √ √

N/A N/A

1MHz

√ √ √

N/A N/A N/A

√ : Communication available

N/A : Communication not available

NOTES:

A communication may not be performed depending on the conditions of temperature or

voltage. In this case, use the R8C UART debugger with the lowered communication

speed.

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