pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 147

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

Revision 1.2
4.0 Embedded Controller Modules
4.9
The PC87591L-N05 includes two USART interface modules. The registers of each module contain ‘n’, and the signals are
suffixed with ‘n’, where ‘n’ is module number 0 or 1.
The USART is a full-duplex synchronous/asynchronous receiver-transmitter that supports a wide range of software program-
mable baud rates and data formats. It handles automatic parity generation and several error detection schemes. USART1
supports DMA transfers to enable fast processor-independent receive and transmit.
4.9.1
4.9.2
The USART is composed of the following functional units:
• Full duplex double-buffered receiver-transmitter
• Synchronous operation
• Asynchronous operation
• Programmable baud rate between CLK/2 and CLK/32768 baud
• Numerous framing formats
• Hardware support of parity-bit generation during transmission and parity-bit check during reception
• Interrupt on transmit buffer empty, receive buffer full and receive error conditions with separate enable
• Software-controlled break transmission and detection
• Internal diagnostic capability
• Automatic error detection
• 9-bit Attention mode
• DMA support for transmit and receive with separate enable
• Transmitter
• Receiver
• Baud rate generator
• Control and error detection
— seven, eight or nine data bits
— one or two stop bits
— odd, even, mark, space or no parity
— Parity Error
— Framing Error
— Data Overrun Error
UNIVERSAL SYNCHRONOUS/ASYNCHRONOUS RECEIVER-TRANSMITTER (USART)
Features
Functional Overview
(Continued)
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