User`s manual

Functional Overview
2.7 Clock Module
Rev.1.01 Jan 31, 2008
2-15
REJ10J1262-0101
2
2.7 Clock Module
The clock module in the M3A-HS11 consists of the following two blocks:
• Output from a oscillator connected to EXTAL of the SH7211
• Ceramic resonator connected to EXTAL and XTAL
The M3A-HS11 has a 10MHz oscillator connected to it as standard specification.
System clock output (PB3/CKIO) of SH7211 is connected to an extension connector with dumping resistor.
To connect an extension board to the extension connector, it is recommended to install a clock buffer that contains
a PLL to ensure that the board will be supplied with a stable clock signal.
Figure 2.7.1 shows the block diagram of clock module.
CLK
Oscillator
SH7211
EXTAL
XTAL
PB3/CKIO
Ceramic Resonators
10MHz
PB3/CKIO(SDRAM Clock)
EXCLK
(Extension Connector)
Not mounted
CY2305SC-1H(Cypress)
Clock Buffer
Rb
Ra
*1：To mount the ceramic oscillator, remove the resistance Ra.
*2：To mount the clock buffer, remove the resistance Rb.
*1
*1
*2
*2
Figure 2.7.1 Block Diagram of Clock Module