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3.5 Selecting Clock Supply
There are two ways to supply a clock to the MCU, using the oscillator circuit of the emulator or using
the oscillator circuit on the target system. Table 3.1 lists the factory-settings of each clock supply.
Table 3.1 Clock supply to the MCU
Clock Description Display of emulator debugger Default setting
X
IN-XOUT
(main clock)
X
CIN-XCOUT
(sub-clock)
Internal oscillator circuit of emulator
(10 MHz)
Target System
Internal oscillator circuit of emulator
(32.768 kHz)
Target System
Internal
External
External
Internal
Yes
-
Yes
-
(1) Selecting Clock Supply
To select the clock supply, change the clock by the Clock tab of the Init dialog box when starting up
the emulator debugger or the CLK command input on the Script Window. For details, refer to user's
manual of the emulator debugger.
(1) Selecting by Init dialog box
• Select main clock supply
• Select sub-clock supply
(2) Selecting by CLK command
An example of CLK command input by the script window is shown below.
example 1) When XIN-XOUT (main clock) is supplied from internal (INT) and XCIN-XCOUT
(sub-clock) is supplied from external (EXT)
CLK INT, EXT
example 2) When XIN-XOUT (main clock) is supplied from external (EXT) and XCIN-XCOUT
(sub-clock) is supplied from internal (INT)
CLK EXT, INT
IMPORTANT
Note on Changing the Clock Supply:
•For using XCIN-XCOUT pins, it is necessary to set "P87/XCIN selection switch" of the
emulator to XCIN side. For how to set it, refer to "2.3 (2) P87/XCIN selection switch"
(page 20).