Uart Modem Status Register - Samsung S3C2416 User Manual

UART

3.8 UART MODEM STATUS REGISTER

There are three UART modem status registers including UMSTAT0, UMSTAT1 in the UART block.
Register
UMSTAT0 0x5000001C
UMSTAT1 0x5000401C
UMSTAT2 0x5000801C
UMSTAT0
Delta CTS
Reserved
Clear to Send
Delta CTS
Read_UMSTAT
14-20
Address R/W
R UART channel 0 modem status register
R UART channel 1 modem status register
R UART channel 2 modem status register
Bit
[4] Indicate that the nCTS input to the S3C2416 has changed state
since the last time it was read by CPU.
(Refer to Figure 14-8.)
0 = Has not changed
1 = Has changed
[3:1]
−
[0] 0 = CTS signal is not activated (nCTS pin is high)
1 = CTS signal is activated (nCTS pin is low)
nCTS
Figure 14-8. nCTS and Delta CTS Timing Diagram
S3C2416X RISC MICROPROCESSOR
Description
Description
Reset Value
0x0
0x0
0x0
Initial State
0
0
0