Download SH7147 Group Debugging MCU Board

Section 2 Setting Up the Debugging MCU Board
2.2.5
Setting the Clock-Selection Jumper
The EXTAL input from the user system or the crystal resonator installed on the debugging MCU
board can be selected as the source of the clock signal for the MCU. Refer to table 2.2 when
selecting the clock.
Figure 2.8 Clock-Selection Jumper
Table 2.2 Correspondence of Clock-Selection Jumper Settings
Silk-Screened Label Jumper Pin (SW3)
Clock to be Used
XTAL
Pins 1-2 closed
Crystal resonator installed on the debugging MCU board
USER CLK
Pins 2-3 closed
EXTAL input from the user system (factory setting)
Note: ‘XTAL’ should only be selected if a crystal resonator has been mounted across the crystalresonator installation sockets (X1) of the debugging MCU board. Users must provide the
crystal resonator.
Rev. 1.10 Apr. 04, 2008 Page 26 of 56
REJ10J1783-0110