HT32F1253_12 datasheet(13/35 Pages) HOLTEK

13 / 35 page

Rev. 1.10

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Universal Synchronous Asynchronous Receiver Transmitter (USART)

▀ Operating frequency: up to 4.5MHz

▀ Supports both asynchronous and clocked synchronous serial communication modes

▀ IrDA SIR encoder and decoder

▀ RS485 mode with output enable control

▀ Full Modem function

▀ FIFO Depth: 16 x 9 bits for both receiver and transmitter

The Universal Synchronous Asynchronous Receiver Transceiver, USART, provides a flexible

full duplex data exchange using synchronous or asynchronous transfer. The USART is used to

translate data between parallel and serial interfaces, and is also commonly used for RS232 standard

communication. The USART peripheral function supports five-types of interrupt including Line

Status Interrupt, Transmitter FIFO Empty Interrupt, Receiver Threshold Level Reaching Interrupt,

Time Out Interrupt and MODEM Status Interrupt. The USART module includes a 16-byte

transmitter FIFO, (TX_FIFO) and a 16-byte receiver FIFO (RX_FIFO).

Software can detect a USART error status by reading the Line Status Register, LSR. The status

includes the type and the condition of transfer operations as well as several error conditions

resulting from Parity, Overrun, Framing and Break events.

The USART includes a programmable baud rate generator which is capable of dividing the

CK_AHB to produce a clock for the USART transmitter and receiver.

Debug Support

▀ Serial Wire Debug Port - SW-DP

▀ 6 instruction comparators and 2 literal comparators for hardware breakpoint or code / literal patch

▀ 4 comparators for hardware watchpoint

▀ 1-bit asynchronous trace - TRACESWO

Package and Operation Temperature

▀ 48-pin LQFP package

▀ Operation temperature range: -40°C to +85°C

HT32F1253 Datasheet(PDF) 13 Page - Holtek Semiconductor Inc