Renesas SH7149 - Manual (Page 25)

Functional Overview
2.5 Clock Module
REJ10J0917-0100
2
2.5 Clock Module
The clock module in the M3A-HS49 consists of the following two blocks:
•
•
Output from a oscillator connected to EXTAL of the SH7149
Ceramic resonator connected to EXTAL and XTAL
The M3A-HS49 has a 10MHz oscillator connected to it as standard specification.
To connect an extension board to the extension connector, we recommend including a clock buffer that contains a
PLL to ensure that the board will be supplied with a stable clock signal.
Figure2.5.1 shows the block diagram of clock module.
CLK
Oscillator
SH7149
EXTAL
XTAL PA15/CK
Ceramic Resonators
10MHz
PA15/CK
(Extension connector)
R9
*
: Not mounted parts
*： To mount the ceramic oscillator, remove R9.
Figure2.5.1 Block Diagram of Clock Module
Rev.1.0 Dec 15, 2006 2-7