Samsung S5PC110, Manual

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S5PC110_UM 1 UNIVERSAL ASYNCHRONOUS RECEIVER AND TRANSMITTER
1-20
1.6.1.4 UART Modem Control Register
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UMCON0, R/W, Address = 0xE290_000C
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UMCON1, R/W, Address = 0xE290_040C
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UMCON2, R/W, Address = 0xE290_080C
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Reserved (Address = 0xE290_0C0C)
There are three UART MODEM control registers in the UART block, namely, UMCON0, UMCON1 and UMCON2.
UMCONn Bit Description Initial State
Reserved [31:8] Reserved 0
RTS trigger Level [7:5] Determines the trigger level of Rx FIFO to control nRTS
signal. If AFC bit is enabled and Rx FIFO have bytes that are
greater than or equal to the trigger level, nRTS signal is
deactivated.
[Channel 0]
000 = 255 bytes 001 = 224 bytes
010 = 192 bytes 011 = 160 bytes
100 = 128 bytes 101 = 96 bytes
110 = 64 bytes 111 = 32 bytes
[Channel 1]
000 = 63 bytes 001 = 56 bytes
010 = 48 bytes 011 = 40 bytes
100 = 32 bytes 101 = 24 bytes
110 = 16 bytes 111 = 8 bytes
[Channel 2]
000 = 15 bytes 001 = 14 bytes
010 = 12 bytes 011 = 10 bytes
100 = 8 bytes 101 = 6 bytes
110 = 4 bytes 111 = 2 bytes
000
Auto Flow Control (AFC) [4] 0 = Disables
1 = Enables 0
Modem Interrupt Enable [3] 0 = Disables
1 = Enables
0
Reserved [2:1] These bits must be 0 00
Request to Send [0] If AFC bit is enabled, this value will be ignored. In this case
the S5PC110 controls nRTS signals automatically.
If AFC bit is disabled, the software must control nRTS signal.
0 = 'H' level (Inactivate nRTS)
1 = 'L' level (Activate nRTS) 0
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 S5PC110 has no nRTS3 and nCTS3.