HT69F240 Datasheet, PDF (130/172 Pages) Holtek Semiconductor Inc – I/O 8-Bit Flash MCU with LED/LCD Driver

HT69F240
I/O 8-Bit Flash MCU with LED/LCD Driver
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
and RX pins will function as defined by the TXEN and RXEN enable control bits.
When the UART is disabled, it will empty the buffer so any character remaining in
the buffer will be discarded. In addition, the value of the baud rate counter will be
reset. If the UART is disabled, all error and status flags will be reset. Also the TXEN,
RXEN, TXBRK, RXIF, OERR, FERR, PERR and NF bits will be cleared, while the
TIDLE, TXIF and RIDLE bits will be set. Other control bits in UCR1, UCR2 and
BRG registers will remain unaffected. If the UART is active and the UARTEN bit is
cleared, all pending transmissions and receptions will be terminated and the module
will be reset as defined above. When the UART is re-enabled, it will restart in the
same configuration.
BNO: Number of data transfer bits selection
0: 8-bit data transfer
1: 9-bit data transfer
This bit is used to select the data length format, which can have a choice of either
8-bit or 9-bit format. When this bit is equal to "1", a 9-bit data length format will be
selected. If the bit is equal to "0", then an 8-bit data length format will be selected. If
9-bit data length format is selected, then bits RX8 and TX8 will be used to store the
9th bit of the received and transmitted data respectively.
PREN: Parity function enable control
0: Parity function is disabled
1: Parity function is enabled
This bit is the parity function enable bit. When this bit is equal to 1, the parity function
will be enabled. If the bit is equal to 0, then the parity function will be disabled.
PRT: Parity type selection bit
0: Even parity for parity generator
1: Odd parity for parity generator
This bit is the parity type selection bit. When this bit is equal to 1, odd parity type will
be selected. If the bit is equal to 0, then even parity type will be selected.
STOPS: Number of stop bits selection
0: One stop bit format is used
1: Two stop bits format is used
This bit determines if one or two stop bits are to be used. When this bit is equal to "1",
two stop bits format are used. If the bit is equal to "0", then only one stop bit format is
used.
TXBRK: Transmit break character
0: No break character is transmitted
1: Break characters transmit
The TXBRK bit is the Transmit Break Character bit. When this bit is equal to "0",
there are no break characters and the TX pin operates normally. When the bit is
equal to "1", there are transmit break characters and the transmitter will send logic
zeros. When this bit is equal to "1", after the buffered data has been transmitted, the
transmitter output is held low for a minimum of a 13-bit length and until the TXBRK
bit is reset.
RX8: Receive data bit 8 for 9-bit data transfer format (read only)
This bit is only used if 9-bit data transfers are used, in which case this bit location will
store the 9^th 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: Transmit data bit 8 for 9-bit data transfer format (write only)
This bit is only used if 9-bit data transfers are used, in which case this bit location
will store the 9^th 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.
Rev. 1.20
130
March 25, 2015