Ampro Corporation 5001692A manual Miscellaneous, Real Time Clock RTC, User Gpio Signals

Chapter 3			Hardware
	Pin #	Signal	Description
	38	VSYNC	Vertical Sync – This signal is used for the digital vertical sync output to the
			CRT. Also used (with HSYNC) to signal power management state information
			to the CRT per the VESA DPMS standard.
	39	AGNDR	Analog Ground for Red
	40	RED	Red – This pin provides the Red analog output to the CRT.
	41	AGNDG	Analog Ground for Green
	42	GREEN	Green – This pin provides the Green analog output to the CRT.
	43	AGNDB	Analog Ground for Blue
	44	BLUE	Blue – This pin provides the Blue analog output to the CRT.

Notes: The shaded area denotes power or ground. The signals marked with * indicate active low.

Miscellaneous

Real Time Clock (RTC)

The CoreModule 420 contains a Real Time (time of day) Clock (RTC), which can be backed up with a Lithium Battery. The CoreModule 420 will function without a battery in those environments, which prohibit inclusion of batteries. The CoreModule 420 will also continue to operate after the battery life has been exceeded. Under these conditions all setup information is restored from the onboard Flash memory during POST along with the default date and time information.

NOTE Some operating systems require a valid default date and time to function.

User GPIO Signals

The CoreModule 420 provides GPIO pins for customer use and the signals are routed to connector J8. An example of how to use the GPIO pins is provided in the Miscellaneous Source Code Examples subdirectory, under the CoreModule 420 Software menu on the CoreModule 420 Doc & SW CD-ROM (cm420\software\examples\GPIO).

CAUTION To prevent a system crash, or render the CoreModule 420 BIOS unusable, do not attempt to use the master GPIO pins (GPIOs 0-7). The STPC Atlas processor has two GPIO blocks, master and slave. The slave GPIO pins are reserved for customer applications. The master GPIO pins are dedicated for BIOS use to control on-board peripherals. The master GPIO pins can not be used for customer applications.

The example program can be built by using the make.bat file. This produces a 16-bit DOS executable application, gpio.exe, which can be run on the CoreModule 420 to demonstrate the use of GPIO pins. For more information about the GPIO pin operation, refer to the Programming Manual for the STPC Atlas processor at:

http://www.stmcu.com/devicedocs-Atlas-75.html

40 Reference Manual CoreModule 420