HT48CU80 Holtek Semiconductor, HT48CU80 Datasheet - Page 24

• Manufacturer Part Number: HT48CU80
• Description: (HT48RU80 / HT48CU80) I/O Type 8-Bit MCU
• Manufacturer: Holtek Semiconductor

www.DataSheet4U.com
Rev. 1.00
NF
The NF flag is the noise flag. When this read only
flag is 0
the flag is 1 it indicates that the UART has de-
tected noise on the receiver input. The NF flag is set
during the same cycle as the RXIF flag but will not
be set in the case of an overrun. The NF flag can be
cleared by a software sequence which will involve a
read to the USR status register, followed by an ac-
cess to the RXR data register.
PERR
The PERR flag is the parity error flag. When this
read only flag is 0 it indicates that a parity error
has not been detected. When the flag is 1 it indi-
cates that the parity of the received word is incor-
rect. This error flag is applicable only if Parity mode
(odd or even) is selected. The flag can also be
cleared by a software sequence which involves a
read to the USR status register, followed by an ac-
cess to the RXR data register.
it indicates a no noise condition. When
24
UCR1 register
The UCR1 register together with the UCR2 register
are the two UART control registers that are used to set
the various options for the UART function, such as
overall on/off control, parity control, data transfer bit
length etc.
Further explanation on each of the bits is given below:
This bit is only used if 9-bit data transfers are used,
in which case this bit location will store the 9th bit of
the transmitted data, known as TX8. The BNO bit is
used to determine whether data transfers are in
8-bit or 9-bit format.
This bit is only used if 9-bit data transfers are used,
in which case this bit location will store the 9th bit of
the received data, known as RX8. The BNO bit is
used to determine whether data transfers are in
8-bit or 9-bit format.
TX8
RX8
HT48RU80/HT48CU80
April 12, 2006