Clock Modules - Renesas M3A-HS64 User Manual

2

2.8 Clock Modules

Provide following clocks with the SH7264 on the M3A-HS64.
• SH7264 input clock: 18 MHz
• SH7264 RTC clock: 32.768 kHz
• SH7264 audio clock: 12.2880 MHz, and 11.2896 MHz (default)
• SH7264 USB clock: 48.00 MHz
• SH7264 LCD clock: 5.33 MHz
How to select the system clock frequency of AK4353 (D/A converter), and AK4524 (audio codec)
SH7264 audio clock provides either 12.2880 MHz or 11.2896 MHz with AK4353 and AK4524 by switching JP7.
The following figure shows the clock module block diagram, and the table below lists the audio clock switching.
JP7
11.2896 MHz
1
CLK
2
3
CLK
12.2880 MHz
(Socket)
CLK
48 MHz
Number
Provides 11.2896 MHz with the AUDIO_X1 pin (default)
JP7
Rev. 1.00 Apr 30, 2009
REJ11J0034-0100
Clock buffer
AUDIO_XTAL
CLK1
CLK2
REF CLK3
CLK4
AUDIO_X1
CLKOUT
AUDIO_X2
NC
3.3 V
3.3 V
MD_CLK0
DIP
MD_CLK1
SW5-1
RTC_X1
32.7683.3 V
RTC_X2
Socket
CLK
EXTAL
CLK
18 MHz
XTAL
NC
USB_X1
USB_X2
48 MHz
Socket
LCD_EXTCLK
CLK
5.33 MHz
Figure 2.8.1 Clock Module Block Diagram
Table 2.8.1 Audio Clock Switching
1-2
SH7264
AUDIO_CLK
AUDIO_CLK
PLL
CKIO
LCD_CLK
Provides 12.2880 MHz with the AUDIO_X1 pin
M3A-HS64 Functions
2.8 Clock Modules
Expansion connector
SDRAM
CLK
2-3
2-25