Ampro Corporation P5X Benutzerhandbuch
Little Board/P5x Technical Manual
2–15
Battery-Backed Clock
An AT-compatible battery-backed real-time clock (with CMOS RAM) is standard on the Little
Board/P5x. A 3.0 volt Lithium battery soldered to the board powers the clock. Battery drain for the
clock is less than 0.4 uA. This battery will support the clock for more than 10 years of normal
usage.
Board/P5x. A 3.0 volt Lithium battery soldered to the board powers the clock. Battery drain for the
clock is less than 0.4 uA. This battery will support the clock for more than 10 years of normal
usage.
The factory initializes the real-time clock and various parameters in the configuration memory for a
standard configuration. The factory sets the date and time, but it may not be set for your time
zone. Use Setup to change these values as needed.
standard configuration. The factory sets the date and time, but it may not be set for your time
zone. Use Setup to change these values as needed.
The contents of the configuration memory are also stored in an on-board EEPROM. The ROM BIOS
reads the EEPROM to get configuration information if the CMOS RAM data is lost. This means
that the board will function if the battery fails. Note that without a battery, the real-time clock
date and time will not be correct.
reads the EEPROM to get configuration information if the CMOS RAM data is lost. This means
that the board will function if the battery fails. Note that without a battery, the real-time clock
date and time will not be correct.
Serial Ports
The Little Board/P5x provides four standard RS-232C serial ports, Serial 1 and Serial 2 at J11, and
Serial 3 and Serial 4 at J13.
Serial 3 and Serial 4 at J13.
All ports support software selectable standard baud rates up to 115.2K bits/second, 5-8 data bits,
and 1, 1.5, or 2 stop bits. Note that the IEEE RS-232C specification limits the serial port to 19.2K
bits/second on cables up to 50 feet in length.
and 1, 1.5, or 2 stop bits. Note that the IEEE RS-232C specification limits the serial port to 19.2K
bits/second on cables up to 50 feet in length.
I/O Addresses and Interrupt Assignments
The serial ports appear at the standard port addresses as shown in Table 2– 10. Each serial port
can be independently disabled using the Setup function, freeing its I/O addresses for use by other
devices installed on the PC/104 and PCI expansion buses.
can be independently disabled using the Setup function, freeing its I/O addresses for use by other
devices installed on the PC/104 and PCI expansion buses.
Table 2– 10 also shows the IRQs assigned to each serial port. Note that these interrupts are shared
resources via serial interrupt protocol. (They do not have PC/104-type interrupt sharing circuits, as
defined in the PC/104 specification.)
resources via serial interrupt protocol. (They do not have PC/104-type interrupt sharing circuits, as
defined in the PC/104 specification.)
Table 2– 10. Serial Port I/O Addresses and Interrupts
Port
I/O Address
Interrupt
Serial 1
3F8h - 3FFh
4
Serial 2
2F8h - 2FFh
3
Serial 3
3E8h - 3EFh
3, 4, 5, 7, 9,
10, 11, 12
Serial 4
2E8h - 2EFh
3, 4, 5, 7, 9,
10, 11, 12
When a serial port is disabled, its I/O addresses and IRQ are available to other peripherals
installed on the PC/104 expansion bus. You can disable any of the serial ports using Setup.
installed on the PC/104 expansion bus. You can disable any of the serial ports using Setup.