MT7697DN datasheet(82/84 Pages) ETC2

82 / 84 page

MT7697D

Internet-of-Things Wireless Connectivity

Page 82 of 84

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

Table 5-4. Bootstrap Option– Flash Access Mode

Flash Access Mode

PIN53 (GPIO37)

Description

Normal mode

Pull-down(1)

Firmware jumps to flash.

Recovery mode

Pull-up

Firmware does not jump to flash and wait for UART

command.

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.

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