Samsung S5PC100 User Manual page 645

S5PC100 USER'S MANUAL (REV1.0)
6.7 UART MODEM STATUS REGISTER
•
UMSTAT0, R, Address = 0xEC00_001C
•
UMSTAT1, R, Address = 0xEC00_041C
•
UMSTAT2, R, Address = 0xEC00_081C
•
Reserved, Address = 0xEC00_0C1C
There are three UART modem status registers namely UMSTAT0, UMSTAT1 and UMSTAT2 in the UART block.
UMSTAT0
Reserved
Delta CTS
Reserved
Clear to Send
Delta CTS
Read _ UMSTAT
Modem_interrupt
Bit
[7:5] reserved
[4] This bit indicates that the nCTS input to the S5PC100 has
changed its state since the last time it was read by CPU. (Refer
Figure 8.1-)
0 = Has not changed
1 = Has changed
[3:1] Reserved
[0] 0 = CTS signal is not activated (nCTS pin is high)
1 = CTS signal is activated (nCTS pin is low)
nCTS
Figure 8.1-9 nCTS and Delta CTS Timing Diagram
Description
UART
Reset Value
000
0
00
0
8.1-21