Samsung S5PC100, User Manual

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S5PC100 USER’S MANUAL (REV1.0) UART
8.1-17
6.3 UART MODEM CONTROL REGISTER
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UMCON0, R/W, Address = 0xEC00_000C
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UMCON1, R/W, Address = 0xEC00_040C
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UMCON2, R/W, Address = 0xEC00_080C
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Reserved (Address = 0xEC00_0C0C)
There are three UART MODEM control registers namely UMCON0, UMCON1 and UMCON2 in the UART block.
UMCONn Bit Description Reset Value
RTS trigger Level [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.
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 S5PC100 controls nRTS automatically.
If AFC bit is disabled, nRTS must be controlled by software.
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 S5PC100 has no nRTS3 and nCTS3.