Renesas SH7149 Manual Do Utilizador

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 

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