32-Bit Arm ®

HT32F5828

Cortex ® -M0+ MCU

17

Smart Card Interface (SCI)

Introduction

The Smart Card Interface, SCI, is compatible with the ISO 7816-3 standard. This interface includes functions for card Insertion/Removal detection, SCI data transfer control logic and data buffers, internal Timer Counters and corresponding control logic circuits to perform the required 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.

As the complexity of ISO7816-3 standard data protocol does not permit comprehensive specifications to be provided in this datasheet, the reader should therefore consult other external information for a detailed understanding of this standard.

f

PCLK

6-bit Prescaler f

PSC_CK f

PSC_CK

11-bit Elementary

Time Unit

(ETU) f

ETU f

ETU

24-bit

Waiting Time

Counter

(WT) f

WT

9-bit

Guard Time

Counter

(GT) f

GT

SCI transfer

Control

Circuitry

Control

Circuitry

SCI TX/RX buffers

Clock

Control

I/O

Control

SCI_CLK

SCI_DIO

Interrupt Control

SCI Interrupt to NVIC

Figure 74. SCI Block Diagram

Card

Detection

SCI_DET

Rev. 1.00 317 of 637 December 28, 2020