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PRELIMINARY
UART
S3C6400 RISC MICROPROCESSOR
31-18
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
UART MODEM CONTROL REGISTER
There are two UART MODEM control registers including UMCON0 and UMCON1 in the UART block.
Note:
UART 2 does not support AFC function, because the S3C6400 has no nRTS2 and nCTS2.
UART 3 does not support AFC function, because the S3C6400 has no nRTS3 and nCTS3.
Register
Address
R/W
Description
Reset Value
UMCON0 0x7F00500C
R/W
UART
channel 0 Modem control register
0x0
UMCON1 0x7F00540C
R/W
UART
channel 1 Modem control register
0x0
Reserved 0x7F00580C
-
Reserved
Undef
Reserved 0x7F005C0C
-
Reserved
Undef
UMCONn
Bit
Description
Initial State
RTS trigger Level
[7:5]
When AFC bit is enabled, these bits determine when to
inactivate nRTS signal.
000 = When RX FIFO contains 63 bytes.
001 = When RX FIFO contains 56 bytes.
010 = When RX FIFO contains 48 bytes.
011 = When RX FIFO contains 40 bytes.
100 = When RX FIFO contains 32 bytes.
101 = When RX FIFO contains 24 bytes.
110 = When RX FIFO contains 16 bytes.
111 = When RX FIFO contains 8 bytes.
000
Auto Flow Control (AFC)
[4]
0 = Disable 1 = Enable
0
Modem Interrupt enable
[3]
Modem interrupt enable
0 = Disable 1 = Enable
000
Reserved
[2:1]
These bits must be 0's
000
Request to Send
[0]
If AFC bit is enabled, this value will be ignored. In this case
the S3C6400 will control nRTS automatically.
If AFC bit is disabled, nRTS must be controlled by software.
0 = 'H' level (Inactivate nRTS) 1 = 'L' level (Activate nRTS)
0