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HT32F2755

Holtek 32-bit Microcontroller with ARM Cortex™-M3 Core

Holtek Semiconductor 

32-bit ARM Cortex™-M3 MCU

HT32F1755/HT32F1765/HT32F2755

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 for USART0

▀ Auto hardware flow control mode – RTS, CTS

▀ FIFO Depth: 16×9 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). The 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.

Smart Card Interface – SCI

▀ Support ISO 7816-3 standard

▀ Character mode

▀ Single transmit buffer and single receive buffer

▀ 11-bit ETU (Elementary Time Unit) counter

▀ 9-bit guard time counter

▀ 24-bit general purpose waiting time counter

▀ Parity generation and checking

▀ Automatic character retry on parity error detection in transmission and reception modes

The Smart Card Interface is compatible with the ISO 7816-3 standard. This interface includes

Card Insertion/Removal detection, SCI data transfer control logic and data buffers, internal

Timer Counters and corresponding control logic circuits to perform all the necessary Smart Card

operations. The Smart Card interface acts as a Smart Card Reader to facilitate communication

with the external Smart Card. The overall functions of the Smart Card interface are controlled

by a series of registers including control and status registers together with several corresponding

interrupts which are generated to get the attention of the microcontroller for SCI transfer status.

Rev. 1.00

14 of 45

August 13, 2012

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