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Board Manual 73
Intel
®
IQ80321 I/O Processor Evaluation Platform
Software Reference
5.2.2 UART
The UART is a TL16C550C. It sits on the Peripheral Bus and is accessed using PCE1 and XINT1# as
shown in Figure 20:
See datasheet at the following link for more information and a pin layout of this device:
http://focus.ti.com/docs/prod/productfolder.jhtml?genericPartNumber=TL16C550C
.
5.2.3 Rotary Switch
The Rotary switch changes the value of a memory mapped register so it can be read later from
software. For example, it can be used to allow the user to select from various boot-up flavors. The
Rotary Switch is accessed using Peripheral Chip Enable #4 (PCE4) through PC_AD[0:3].
Figure 20. UART Connection to Peripheral Bus
Table 89. UART Register Settings
Address Read Register Write Register
FE81 0000H Receive Holding Register Transmit Holding Register
FE81 0001H Unused Interrupt Enable Register
FE81 0002H Interrupt Status Register FIFO Control Register
FE81 0003H Unused Line Control Register
FE81 0004H Unused Modem Control Register
FE81 0005H Line Status Register Unused
FE81 0006H Modem Status Register Unused
FE81 0007H Scratchpad Register Scratchpad Register