Rainbow Electronics W90N740 - Manual (Page 160)

W90N740
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Transmit Holding Register (THR)
Register Address R/W Description Reset Value
THR 0xFFF8.0000 W Transmit Holding Register (DLAB = 0) Undefined
7 6 5 4 3 2 1 0
8-bit Transmitted Data
8-bit Transmitted Data [7:0]
By writing to this register, the UART will send out an 8-bit data through the SOUT pin (LSB first).
Interrupt Enable Register (IER)
Register Address R/W Description Reset Value
IER 0xFFF8.0004 R/W Interrupt Enable Register (DLAB = 0) 0x0000.0000
7 6 5 4 3 2 1 0
RESERVED nDBGACK_EN MSIE RLSIE THREIE RDAIE
nDBGACK_EN [4]: ICE debug mode acknowledge enable
0 = When DBGACK is high, the UART receiver time-out clock will be held
1 = No matter what DBGACK is high or not, the UART receiver timer-out clock will not be held
MSIE [3]: MODEM Status Interrupt (Irpt_MOS) Enable
0 = Mask off Irpt_MOS
1 = Enable Irpt_MOS
RLSIE [2]: Receive Line Status Interrupt (Irpt_RLS) Enable
0 = Mask off Irpt_RLS
1 = Enable Irpt_RLS
THREIE [1]: Transmit Holding Register Empty Interrupt (Irpt_THRE) Enable
0 = Mask off Irpt_THRE
1 = Enable Irpt_THRE