COP8AME9_14 Datasheet, PDF (52/102 Pages) Texas Instruments – COP8AME9 8-Bit CMOS Flash Microcontroller with 8k Memory, Dual Op Amps, Virtual EEPROM, Temperature Sensor, 10-Bit A/D and Brownout Reset

COP8AME9, COP8ANE9
SNOS930F – MARCH 2001 – REVISED MARCH 2013
www.ti.com
RBIT9: Contains the ninth data bit received when the USART is operating with nine data bits per frame. Read
only, cleared on reset.
ATTN: ATTENTION Mode is enabled while this bit is set. This bit is cleared automatically on receiving a
character with data bit nine set. Read/Write, cleared on reset.
XMTG: This bit is set to indicate that the USART is transmitting. It gets reset at the end of the last frame (end of
last Stop bit). Read only, cleared on reset.
RCVG: This bit is set high whenever a framing error or a Break Detect occurs and goes low when RDX goes
high. Read only, cleared on reset.
ENUI—USART INTERRUPT AND CLOCK SOURCE REGISTER (Address at 0BC)
STP2
Bit 7
BRK
ETDX
SSEL
XRCLK
XTCLK
ERI
ETI
Bit 0
STP2: This bit programs the number of Stop bits to be transmitted. Read/Write, cleared on reset.
STP2 = 0 One Stop bit transmitted.
STP2 = 1 Two Stop bits transmitted.
BRK: Holds TDX (USART Transmit Pin) low to generate a Line Break. Timing of the Line Break is under
software control.
ETDX: TDX (USART Transmit Pin) is the alternate function assigned to Port L pin L2; it is selected by setting
ETDX bit.
SSEL: USART mode select. Read only, cleared on reset.
SSEL = 0 Asynchronous Mode.
SSEL = 1 Synchronous Mode.
XRCLK: This bit selects the clock source for the receiver section. Read/Write, cleared on reset.
XRCLK = 0 The clock source is selected through the PSR and BAUD registers.
XRCLK = 1 Signal on CKX (L1) pin is used as the clock.
XTCLK: This bit selects the clock source for the transmitter section. Read/Write, cleared on reset.
XTCLK = 0 The clock source is selected through the PSR and BAUD registers.
XTCLK = 1 Signal on CKX (L1) pin is used as the clock.
ERI: This bit enables/disables interrupt from the receiver section. Read/Write, cleared on reset.
ERI = 0 Interrupt from the receiver is disabled.
ERI = 1 Interrupt from the receiver is enabled.
ETI: This bit enables/disables interrupt from the transmitter section. Read/Write, cleared on reset.
ETI = 0 Interrupt from the transmitter is disabled.
ETI = 1 Interrupt from the transmitter is enabled.
ASSOCIATED I/O PINS
Data is transmitted on the TDX pin and received on the RDX pin. TDX is the alternate function assigned to Port L
pin L2; it is selected by setting ETDX (in the ENUI register) to one. RDX is an inherent function Port L pin L3,
requiring no setup. Port L pin L2 must be configured as an output in the Port L Configuration Register in order to
be used as the TDX pin.
The baud rate clock for the USART can be generated on-chip, or can be taken from an external source. Port L
pin L1 (CKX) is the external clock I/O pin. The CKX pin can be either an input or an output, as determined by
Port L Configuration and Data registers (Bit 1). As an input, it accepts a clock signal which may be selected to
drive the transmitter and/or receiver. As an output, it presents the internal Baud Rate Generator output.
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