MT7697DN datasheet(38/84 Pages) ETC2

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MT7697D

Internet-of-Things Wireless Connectivity

Page 38 of 84

This document contains information that is proprietary to MediaTek Inc. (“MediaTek”) and/or its licensor(s).

Any unauthorized use, reproduction or disclosure of this document in whole or in part is strictly prohibited.

2.4.12

SYSRAM_CM4

SYSRAM, the internal SRAM, is mapped on the system bus interface of Cortex-M4. M4 can carry out

instruction fetches and data accesses to the SYSRAM.

SYSRAM is the internal SRAM that the DMA engine can access. It can be used as a GDMA or VFIFO

buffer, the source and the destination of GDMA controller, for memory-to-memory transfer as well

the transfer between memory and peripherals.

2.4.13

Crypto engine

The crypto engine supports



AES, DES, and 3DES encryption and decryption engine.



SHA256, SHA512 and MD5 hash engines.

2.5

Peripherals

Several peripheral are multiplexed GPIOs. MT7697D has two dedicated UART interfaces with flow

control, one dedicated I2C interface, and one dedicated IrDA interface.

MT7697D also has the 2nd I2C interface, the SPI slave interface, the I2S interface, and the SPI master

interface, but only 2 of the above interfaces can be effective at a time.

The section describes the function of all the peripherals.

2.5.1

GPIO Interface

2.5.1.1

GPIO Function

There are two types of GPIO (General purpose IO) designs in MT7697D: GPIO and AGPIO.

Floating-well design is used in GPIO and AGPIO. It prevents potential leakage problem when the

DVDD33 power supply is not enabled but the pin input is pulled up to 3.3V source.

MT7697D offers GPIO, each with the following configuration options:



Input / Output mode



Slew rate control



Schmitt trigger hysteresis control



Input mode: Floating (Hi-Z), pull-up, or pull-down



Output mode: Active driving, or open drain



Pull up/down control. The pull-up and pull-down resistance is 75KΩ with ±20% variation

over PVT condition



Driving strength: 4mA, 8mA, 12mA, 16mA



Input and output duty cycle tuning

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