z16f2811 ZiLOG Semiconductor, z16f2811 Datasheet - Page 325

• Manufacturer Part Number: z16f2811
• Description: High Performance Microcontrollers
• Manufacturer: ZiLOG Semiconductor

PS022006-0207
Serial Errors
Interrupts
DBG pin used as a GPIO pin
The UARTEN control bit must be set to one to use the serial interface as a UART. Clearing
the UARTEN control bit to zero will prevent data received on the DBG pin from being
written to the Receive Data Register. Clearing the UARTEN control bit to zero also
prevents data written to the Transmit Data Register from being transmitted on the single
pin interface.
If the UART is disabled, data is still written to the Receive Data register and read from the
Transmit Data register. These actions still generates UART interrupts. The UARTEN con-
trol bit only prevents data from being transmitted to or received from the DBG pin.
The serial interface detects the following error conditions:
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Transmission of data is prevented if the transmit collision, receive framing error, receive
break detect, receive overrun, or receive data register full status bits are set.
The Debug UART generates interrupts during the following conditions:
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The DBG pin is used as a GPIO pin. The serial interface cannot be used for debugging
when the DBG pin is configured as a GPIO pin. To set up the DBG pin as a GPIO pin,
software must clear the
Software uses the pin as an input by clearing the output enable control bit. The PIN status
bit in
The DBG pin is configured as an output pin by setting the output enable control bit. The
logic state of the IDLE bit in
pin.
Receive framing error (received Stop bit is Low).
Transmit collision (OCD releases the bus high to send a logic 1 and detects it is Low).
Receive overrun (received data before previously received data read).
Receive break detect (10 or more bits low).
Receive Data register is Full (includes Rx Framing Error and Rx Overrun Error).
Transmit Data register is empty.
Auto-Baud Detector loads the BRG (auto-baud character received).
Receive Break detected.
Line Control Register (DBGLCR)
DBGUART
P R E L I M I N A R Y
Line Control Register (DBGLCR)
option bit and
reflects the state of the DBG pin.
OCDEN
control bit.
is driven onto the DBG
Product Specification
ZNEO
On-Chip Debugger
™
Z16F Series
311