QB-78K0FX2-T44GB Datasheet, PDF (24/44 Pages) Renesas Technology Corp – IECUBE is a registered trademark of NEC Electronics Corporation in Japan and Germany PC/AT is a trademark of International Business Machines Corporation.

CHAPTER 2 SETUP PROCEDURE
2.3.2 Clock setting methods
This section shows the clock settings.
Table 2-1. Setting Main System Clock
Type of Clock to Use
OSC1
Debugger Setting
(1)
Use internally generated clock
(2)
Use target system clock^Note
−
System Clock
−
External Clock
(3)
Generate clock from oscillator
Mount oscillator.
Clock Board
Note Do not select this setting when TARGET LED is not lit.
Remarks 1. Settings other than the above are prohibited.
2. Selection of (1) or (2) is possible regardless of whether the oscillator is or is not mounted on OSC1.
Table 2-2. Setting Subsystem Clock
Type of Clock to Use
Remarks
(1) Use internally generated clock
(2) Use target system clock^Note
System Clock
External Clock
Note Do not select this setting when TARGET LED is not lit.
Remark Settings other than the above are prohibited.
2.3.3 Main system clock
(1) For using internally generated clock
Select “System Clock” in the debugger and select the desired frequency from the dialog menu.
(2) For using target system clock
Select “External Clock” in the debugger to use the clock input from the target system.
To input the clock from the target system, input the square wave with the same potential as the target device to
the clock pin (X2) (inputting inverted waveform to the X1 pin is unnecessary).
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User’s Manual U17669EJ3V0UM