Renesas M3A-HS64, User Manual

Page: 63 / 238

M3A-HS64 Functions
2.8 Clock Modules
Rev. 1.00 Apr 30, 2009
2-25
REJ11J0034-0100
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
¾
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.
SH7264
LCD_CLK
CKIO
AUDIO_X2
AUDIO_X1
DIP
SW5-1
3.3 V
MD_CLK0
MD_CLK1
EXTAL
CLK
18 MHz
USB_X1
USB_X2
CLK
48 MHz
XTAL
RTC_X1
RTC_X2
32.7683.3 V
48 MHz
NC
NC
LCD_EXTCLK
CLK
5.33 MHz
CLK
SDRAM
JP7
CLK
11.2896 MHz
CLK
12.2880 MHz
(Socket)
REF
CLKOUT
CLK1
CLK3
CLK2
CLK4
Clock buffer
PLL
AUDIO_CLK
Expansion connector
Socket
CLK
Socket
AUDIO_XTAL
AUDIO_CLK
3.3 V
2
3
1
Figure 2.8.1 Clock Module Block Diagram
Table 2.8.1 Audio Clock Switching
Number
1-2 2-3
JP7
Provides 11.2896 MHz with the AUDIO_X1 pin (default) Provides 12.2880 MHz with the AUDIO_X1 pin