HT45B0F Holtek Semiconductor, HT45B0F Datasheet - Page 11

• Manufacturer Part Number: HT45B0F
• Description: SPI-to-UART Bridge
• Manufacturer: Holtek Semiconductor

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Rev. 1.00
UCR3 register
The UCR3 register is the last of the UART control registers and controls the software reset operation. The only one
available bit named URST in the UART control register UCR3 is the UART software reset control bit. When this bit is
equal to 0 , the UART operates normally. If this bit is equal to 1 , the whole HT45B0F will be reset. When this situa-
tion occurs, the transmitter and receiver will be reset. The UART registers including the status register and control
registers will keep the POR states shown in the above UART registers table after the reset condition occurs.
Bit 3
Bit 2
Bit 1
Bit 0
Bit 7
Bit 6~0
Name
POR
R/W
Bit
WAKE: RX pin falling edge wake-up function enable control
This bit enables or disables the receiver wake-up function. If this bit is equal to 1 and the
MCU is in IDLE or SLEEP mode, a falling edge on the RX input pin will through INT pin wake-up
the device. If this bit is equal to 0 and the MCU is in IDLE or SLEEP mode,
any edge transitions on the RX pin will not wake-up the device.
RIE: Receiver interrupt enable control
This bit enables or disables the receiver interrupt. If this bit is equal to 1 and when the
receiver overrun flag OERR or receive data available flag RXIF is set, the UART interrupt request
flag will be set. If this bit is equal to 0 , the UART interrupt request flag will not be influenced
by the condition of the OERR or RXIF flags.
TIIE: Transmitter Idle interrupt enable control
This bit enables or disables the transmitter idle interrupt. If this bit is equal to 1 and when
the transmitter idle flag TIDLE is set, due to a transmitter idle condition, the UART interrupt
request flag will be set. If this bit is equal to 0 , the UART interrupt request flag will not be
influenced by the condition of the TIDLE flag.
TEIE: Transmitter Empty interrupt enable control
This bit enables or disables the transmitter empty interrupt. If this bit is equal to 1 and when
the transmitter empty flag TXIF is set, due to a transmitter empty condition, the UART interrupt
request flag will be set. If this bit is equal to 0 , the UART interrupt request flag will not be
influenced by the condition of the TXIF flag.
URST
URST: UART software reset
unimplemented, read as 0
R/W
0: RX pin wake-up function is disabled
1: RX pin wake-up function is enabled
0: receiver related interrupt is disabled
1: receiver related interrupt is enabled
0: transmitter idle interrupt is disabled
1: transmitter idle interrupt is enabled
0: transmitter empty interrupt is disabled
1: transmitter empty interrupt is enabled
0: no action
1: UART reset occurs
7
0
6
5
11
4
3
2
1
HT45B0F
June 7, 2011
0
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