ESP-12K Specification V1.0
C
opyright © 2019 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved
XIV
33
IO39
MTCK, GPIO39, CLK_OUT3
34
IO40
MTDO, GPIO40, CLK_OUT2
35
IO41
MTDI, GPIO41, CLK_OUT1
36
IO42
MTMS, GPIO42
37
U0TX
U0TXD, GPIO43, CLK_OUT1
38
U0RX
U0RXD, GPIO44, CLK_OUT2
39
IO45
GPIO45
40
IO46
GPIO46
41
EN
High level: chip enable;
Low level: the chip is off;
Has been raised by default.
42
GND
Ground
List Module startup mode description
System startup mode
Pin
Default
SPI startup mode
Download startup
mode
IO0
Pull up
1
0
IO46
Pull down
Irrelevant
0
Note: Some pins have been pulled up internally, please refer to the schematic
