Renesas M3A-HS85, User Manual, Page: 29 / 70

Functional Overview
2.8 Clock Module
Rev.1.04 2008.7.10
2-13
REJ10J1564-0104
2
2.8 Clock Module
The clock module in the M3A-HS85 consists of the following two blocks:
•
•
Output from a oscillator connected to EXTAL of the SH7285
Ceramic resonator connected to EXTAL and XTAL
The M3A-HS85 has a 12.5MHz ceramic oscillator connected to it as standard specification. (The oscillator is
mounted via 8-pin IC socket.)
When the ceramic resonator is used, R7 should be removed.
Figure 2.8.1 shows the block diagram of clock module.
CLK
Oscillator
SH7285
EXTAL
XTAL
PA15/CK
Ceramic resonator
12.5MHz
Extension connector
：
Not mounted component
R7
*1
*1
*1
：
To mount the ceramic resonator, R7 should be removed.
0
SDRAM(U3)_CLK pin
Figure 2.8.1 Block Diagram of Clock Module