TC1796
Functional Description
Mode, 8-bit or 9-bit data transfer, parity generation, and the number of stop bits can be
selected. Parity, framing, and overrun error detection are provided to increase the
reliability of data transfers. Transmission and reception of data are double-buffered. For
multiprocessor communication, a mechanism is included to distinguish address bytes
from data bytes. Testing is supported by a loop-back option. A 13-bit baud rate generator
provides the ASC with a separate serial clock signal which can be very accurately
adjusted by a prescaler implemented as a fractional divider.
Each ASC module, ASC0 and ASC1, communicates with the external world via two I/O
lines. The RXD line is the receive data input signal (in Synchronous Mode also output).
TXD is the transmit output signal. In the TC1796, the two I/O lines of each ASC can be
alternatively switched to different pairs of GPIO lines.
Clock control, address decoding, and interrupt service request control are managed
outside the ASC module kernel.
Features
•
Full-duplex asynchronous operating modes
– 8-bit or 9-bit data frames, LSB first
– Parity bit generation/checking
– One or two stop bits
– Baud rate from 4.69 Mbit/s to 1.12 Bit/s (@ 75 MHz clock)
– Multiprocessor mode for automatic address/data byte detection
– Loop-back capability
•
Half-duplex 8-bit synchronous operating mode
– Baud rate from 9.38 Mbit/s to 763 Bit/s (@ 75 MHz clock)
Double buffered transmitter/receiver
•
•
Interrupt generation
– On a transmit buffer empty condition
– On a transmit last bit of a frame condition
– On a receive buffer full condition
– On an error condition (frame, parity, overrun error)
Data Sheet
49
V1.0, 2008-04
INFINEON [ Infineon ]
