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UART S3C2410A
11-18
UART MODEM STATUS REGISTER
There are two UART modem status registers including UMSTAT0 and UMSTAT1 in the UART block.
Register Address R/W Description Reset Value
UMSTAT0 0x5000001C R UART channel 0 Modem status register 0x0
UMSTAT1 0x5000401C R UART channel 1 Modem status register 0x0
Reserved 0x5000801C – Reserved Undef
UMSTAT0 Bit Description Initial State
Delta CTS [4] Indicate that the nCTS input to the S3C2410A has
changed state since the last time it was read by CPU.
(Refer to Figure 11-8.)
0 = Has not changed
1 = Has changed
0
Reserved [3:1] 0
Clear to Send [0] 0 = CTS signal is not activated (nCTS pin is high.)
1 = CTS signal is activated (nCTS pin is low.)
0
nCTS
Delta CTS
Read_UMSTAT
Figure 11-8. nCTS and Delta CTS Timing Diagram