Rtc Nvram; Interrupts; Compactflash / Expansion Bus; Sa-1110 Gpio Cross-Reference - Applied Data Systems Bitsy Plus User Manual

Bitsy Plus User's Manual

RTC NVRAM

The real-time clock chip includes 56 bytes of non-volatile RAM. The RAM is maintained as long
as main or backup power is provided to the chip. Drivers are not yet available to access this
feature. Contact ADS Sales if your application requires this feature.
4.1.4

Interrupts

The Bitsy Plus includes several sources for external interrupts. The following table summarizes
the external interrupt sources and the devices to which they are connected.
Your operating system may not include drivers for all interrupt sources.
4.1.5

CompactFlash / Expansion Bus

The Bitsy Plus makes its CompactFlash bus signals available on J9. These signals can be used to
add a CompactFlash socket to a daughter board or to expand the capabilities of the Bitsy Plus as a
digital expansion bus. The voltage of the bus signals are set by the CardBVcc voltage (3.3 V or
5 V).
The ADS Bitsy CF and Ethernet Personality Boards use this bus for CF and digital expansion,
respectively. The schematic (ADS document number 640111-8000, available on the ADS Support
Forums) illustrates how to use this bus both ways.
4.1.6

SA-1110 GPIO Cross-Reference

The following table describes how the Bitsy Plus utilizes the StrongARM GPIO lines (GPn).
They are offered for reference purposes only. Most operating systems make this information
transparent to developers.
11
I=input, O=output
Page 18
Interrupt Signal
/RqOnOff
CARDBIRQ
/EXT_IRQ1
/EXT_IRQ2
/EXT_IRQ3
GP Signal Name
0 SA1111_IRQ
1 WAKE_UP
2 LDD8
3 LDD9
4 LDD10
5 LDD11
6 LDD12
7 LDD13
8 LDD14
9 LDD15
10 EXT_IRQ3
11 CODEC_RES
12
USB_RECONN
13 IRQ_SSP
Pin IRQ Handler
J3.45 ADSmartIO
J9.27 SA-1111
J10.1 SA-1111, GPIO_B<5>
J10.3 SA-1111, GPIO_B<4>
J10.35 SA-1110, GP 10
11
I/O Function, Connector
I SA-1111 interrupt
I wakeup from ADSmartIO
O
O
O
O
LCD display (J1)
O
O
O
O
I External interrupt 3 (4.1.4)
O Codec reset
O USB Reconnect (J3)
I ADSmartIO interrupt
ADS document # 110114-1001A