[ts-7000] TS-7400 14.7456Mhz clock on DIO

To:
Subject:	[ts-7000] TS-7400 14.7456Mhz clock on DIO_13
From:	Colin Copeland <>
Date:	Mon, 23 Apr 2007 15:33:55 -0400

Hey guys,

I'm attempting to use the 14.7456Mhz clock on my TS-7400. The  
documentation says:

Should you require it, a 14.7456Mhz clock can be output from the
TS-7400 on DIO_13.  To enable this, set bit 3 of the 8-bit register
at address 0x12000000 and set the data direction for DIO_13 as
output.
...
0x1200_0000: TS-7400 control register
   bit 0 - if set, enables UART #1 on DIO_18 and DIO_19 pins
   bit 1 - if set, enables IRQ on DIO_11 pin
   bit 2 - if set, enables DRQ on DIO_12 pin
   bit 3 - if set, enables 14.7456Mhz clock on DIO_13 pin
   bit 7:4 - reserved
...
0x12c0_0000: GPIO direction for DIO_0 to DIO_7 ('1' means output)
0x12c0_0001: GPIO direction for DIO_8 to DIO_15 ('1' means output)
0x12c0_0002: GPIO data register for DIO_0 to DIO_7/GPBUS address  
register
0x12c0_0003: GPIO data register for DIO_8 to DIO_15
...
(http://www.embeddedarm.com/Manuals/ts-7400-info.txt)

So, set DIO_13 direction to output ('1' means output):

:root# poke8 0x12c00001 0x20
:root# peek8 0x12c00001
0x20

Enable 14.7456Mhz clock on DIO_13 (set bit 3 to '1')

:root# poke8 0x12000000 0x8
:root# peek8 0x12000000
0x8

Hooking up an oscilloscope to DIO_13 and GND shows a steady 3.3V (my  
multimeter agrees). I see no signs of a clock. Writing a 1 or 0 to  
0x12c00003 for DIO_13 switches between 0V and 3.3V, respectively.

I'm not really sure what to do. Any ideas?

thanks,
   colin



 
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[ts-7000] TS-7400 14.7456Mhz clock on DIO_13