TC1796
Peripheral Units (Vol. 2 of 2)
Asynchronous/Synchronous Serial Interface (ASC)
User’s Manual 19-2 V2.0, 2007-07
ASC, V2.0
19.1.1 Overview
The ASC provides serial communication between the TC1796 and other
microcontrollers, microprocessors, or external peripherals.
The ASC supports full-duplex asynchronous communication and half-duplex
synchronous communication. In Synchronous Mode, data is transmitted or received
synchronous to a shift clock that is generated by the ASC internally. In Asynchronous
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 is 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 accurately adjusted
by a prescaler implemented as fractional divider.
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 module 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 module 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)
To Next Page
Loading...
Need help?
General