AM186ES Advanced Micro Devices, AM186ES Datasheet - Page 147

• Manufacturer Part Number: AM186ES
• Description: microcontrollers provide a low-cost/ high-performance solution for embedded system designers who wish to use the x86 architecture.
• Manufacturer: Advanced Micro Devices

10
10.1
10.1.1
CHAPTER
ASYNCHRONOUS SERIAL PORTS
OVERVIEW
The Am186ES and Am188ES microcontrollers provide two independent asynchronous
serial ports. These ports provide full-duplex, bidirectional data transfer using several
industry-standard communications protocols. The serial ports may be used as sources or
destinations of DMA transfers.
The asynchronous serial ports support the following features:
Serial Port Flow Control
The Am186ES and Am188ES microcontrollers provide two identical asynchronous serial
ports. Four external pins are available for each port, as shown in Table 10-1.
Full-duplex operation
7-bit, 8-bit, or 9-bit data transfers
Odd, even, or no parity
One stop bit
Two lengths of break characters
Error detection
— Parity errors
— Framing errors
— Overrun errors
Hardware handshaking with the following selectable control signals:
— Clear-to-send (CTS)
— Enable-receiver-request (ENRX)
— Ready-to-send (RTS)
— Ready-to-receive (RTR)
DMA to and from the serial ports
Separate maskable interrupts for each port
Multidrop protocol (9-bit) support
Independent baud rate generators
Maximum baud rate of 1/16th of the CPU clock
Double-buffered transmit and receive
Asynchronous Serial Port
10-1