MT7697 datasheet(79/81 Pages) ETC2

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MT7697

Internet-of-Things Wireless Connectivity

Page 79 of 81

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.

This mode is used for the firmware to jump to SYSRAM

after downloading code from UART.

Note 1: No external pull-down resistor is required because internal pull-down is active during power

up.

Table 5-5. Bootstrap Option – XTAL Clock Mode

XTAL Clock Mode

PIN12 (GPIO7)

PIN52 (GPIO38)

Description

40MHz

Pull-down

Pull-up

Uses 40MHz XTAL.

26MHz

Pull-up

Pull-down(1)

Uses 26MHz XTAL.

52MHz

Pull-up

Uses 52MHz XTAL.

Note 1: No external pull-down resistor is required because internal pull-down is active during power

up.

Table 5-6. Bootstrap Option – 32KHz Clock Mode

32KHz clock mode

PIN11 (GPIO6)

Description

Internal 32KHz clock

Pull-down

32KHz clock sources from 40/26/52MHz clock.

External 32KHz clock

Pull-up

32KHz clock sources from external pin.

Table 5-7. Bootstrap Option — Chip Mode

Chip mode

PIN55

(GPIO35)

PIN10

(GPIO5)

PIN11

(GPIO6)

PIN12

(GPIO7)

PIN52

(GPIO38)

Description

Normal mode

Pull-

down(1)

Don’t care

32KHz clock

mode

control

XTAL clock mode control

Chip operates in normal

mode.

Test mode

Pull-up

Chip operates in test

mode.

Note 1: No external pull-down resistor is required because internal pull-down is active during power

up.

Note 2: When in test mode, the XTAL input clock is 26MHz only.

Pins 10, 11, 12, 52, 53, and 55 are is used for bootstrap. The system design should follow the

following guideline:



Those pins shall not be used as input functions because the signals from another device

might affect the values sensed.



Those pins shall not be used as an open-drain function because the pull-up resistor

would affect the values sensed.

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