Samsung S5PC100 User Manual page 641

S5PC100 USER'S MANUAL (REV1.0)
6.3 UART MODEM CONTROL REGISTER
•
UMCON0, R/W, Address = 0xEC00_000C
•
UMCON1, R/W, Address = 0xEC00_040C
•
UMCON2, R/W, Address = 0xEC00_080C
•
Reserved (Address = 0xEC00_0C0C)
There are three UART MODEM control registers namely UMCON0, UMCON1 and UMCON2 in the UART block.
UMCONn
RTS trigger Level
Auto Flow Control (AFC)
Modem Interrupt Enable
Reserved
Request to Send
NOTE: UART 2 supports AFC function, if nRxD3 and nTxD3 are set as nRTS2 and nCTS2 by GPA1CON.
UART 3 does not support AFC function, because the S5PC100 has no nRTS3 and nCTS3.
Bit
[7:5] If AFC bit is enabled, these bits determine when to inactivate
nRTS signal.
000 = If RX FIFO contains 63 bytes.
001 = If RX FIFO contains 56 bytes.
010 = If RX FIFO contains 48 bytes.
011 = If RX FIFO contains 40 bytes.
100 = If RX FIFO contains 32 bytes.
101 = If RX FIFO contains 24 bytes.
110 = If RX FIFO contains 16 bytes.
111 = If RX FIFO contains 8 bytes.
[4] 0 = Disables
[3] 0 = Disables
[2:1] These bits must be 0
[0] If AFC bit is enabled, this value will be ignored. In this case
the S5PC100 controls nRTS automatically.
If AFC bit is disabled, nRTS must be controlled by software.
0 = 'H' level (Inactivate nRTS)
Description
1 = Enables
1 = Enables
1 = 'L' level (Activate nRTS)
UART
Reset Value
000
0
0
00
0
8.1-17