SH7243 datasheet(107/1726 Pages) RENESAS

107 / 1726 page

Section 4 Clock Pulse Generator (CPG)

Rev. 1.00 Jun. 26, 2008 Page 77 of 1692

REJ09B0393-0100

4.2

Input/Output Pins

Table 4.1 lists the clock pulse generator pins and their functions.

Table 4.1

Pin Configuration and Functions of the Clock Pulse Generator

Pin Name

Symbol

I/O

Function

XTAL

Output Connected to the crystal resonator. (Leave this pin open when the

crystal resonator is not in use.)

Crystal input/output

pins (clock input

pins)

EXTAL

Input

Connected to the crystal resonator or used to input an external

clock.

Clock output pin

Output Clock output pin. This pin can be placed in high-impedance state.

USBXTAL

Output Connected to the crystal resonator for USB (equivalent for

CSTCZ48M0X11R). Leave this pin open when the crystal

resonator is not in use.

Crystal input/output

pins for USB (clock

input pins)

USBEXTAL

Input

Connected to the crystal resonator for USB (equivalent for

CSTCZ48M0X11R). Connect this pin to Vss when the crystal

resonator is not in use.

To use the clock output (CK) pin, appropriate settings may be needed in the pin function controller

(PFC) in some cases. For details, refer to section 23, Pin Function Controller (PFC).

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