Clock Module - Renesas Renasas Single-Chip Microcomputer SH7086 User Manual

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2.7 Clock Module

The clock module in the M3A-HS86 consists of the following two blocks:
•
Output from a oscillator connected to EXTAL of the SH7086
•
Ceramic resonator connected to EXTAL and XTAL
The M3A-HS86 has a 10MHz oscillator connected to it as standard specification.
The system clock output (PA15/CK) of SH7086 is connected to an extension connector through the damping
resister. To connect an extension board to an 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.
Figure2.7.1 shows the block diagram of clock module.
Oscillator
*1
R3
CLK
*1： To mount the ceramic oscillator, remove R3.
*2： To mount the clock buffer, remove R7.
Not mounted parts
Rev.1.0 Feb 06. 2007
REJ10J0916-0100
SH7086
PA15/CK
EXTAL
XTAL
*1
Ceramic Oscillator
10MHz
Figure2.7.1 Block Diagram of Clock Module
*2
R7
*2
Clock Buffer
CY2305SC-1H(Cypress)
PA15/CK(SDRAM Clock, Extension Connector)
Functional Overview
2.7 Clock Module
EXCLK
(Extension
Connector)
2-14