Samsung S3C6400X User Manual page 1013

UART
UART MODEM CONTROL REGISTER
Register Address
UMCON0 0x7F00500C
UMCON1 0x7F00540C
Reserved 0x7F00580C
Reserved 0x7F005C0C
There are two UART MODEM control registers including UMCON0 and UMCON1 in the UART block.
UMCONn
RTS trigger Level
Auto Flow Control (AFC)
Modem Interrupt enable
Reserved
Request to Send
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.
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.
R/W
R/W UART channel 0 Modem control register
R/W UART channel 1 Modem control register
- Reserved
- Reserved
Bit
[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.
[4] 0 = Disable
[3] Modem interrupt enable
0 = Disable
[2:1] These bits must be 0's
[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)
S3C6400 RISC MICROPROCESSOR
Description
Description
1 = Enable
1 = Enable
1 = 'L' level (Activate nRTS)
Reset Value
0x0
0x0
Undef
Undef
Initial State
000
0
000
000
0