ESP8266 datasheet(116/117 Pages) ESPRESSIF

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Appendix 4

Timer Registers

Address RegName

Signal

BitPos Default

SW(R/W) Description

0x0

FRC1_LOAD_ADDRESS

frc1_load_value

[22:0] 23'b0

R/W

the load value into the counter

0x4

FRC1_COUNT_ADDRESS frc1_count

[22:0] 23'h7fffff RO

the current value of the counter. It is a decreasing

counter.

0x8

FRC1_CTRL_ADDRESS

[31:9] 23'b0

frc1_int

[8]

1'b0

the status of the interrupt, when the count is

dereased to zero

frc1_ctrl

[7:0]

8'b0

R/W

bit[7]: timer enable

bit[6]: automatically reload, when the counter is

equal to zero

bit[3:2]: prescale-divider, 0: divided by 1, 1: divided

by 16, 2 or 3: divided by 256

bit[0]: interrupt type, 0:edge, 1:level

0xC

FRC1_INT_ADDRESS

[31:1] 30'b0

frc1_int_clr_mask [0]

1'b0

R/W

write to clear the status of the interrupt, if the

interrupt type is "level"

0x20

FRC2_LOAD_ADDRESS

frc2_load_value

[31:0] 32'b0

R/W

the load value into the counter

0x24

FRC2_COUNT_ADDRESS frc2_count

[31:0] 32'b1

the current value of the counter. It is a increasing

counter.

0x28

FRC2_CTRL_ADDRESS

[31:9] 23'b0

frc2_int

[8]

1'b0

the status of the interrupt, when the count is equal to

the alarm value

frc2_ctrl

[7:0]

8'b0

R/W

bit[7]: timer enable

bit[6]: automatically reload, when the counter is

equal to zero

bit[3:2]: prescale-divider, 0: divided by 1, 1: divided

by 16, 2 or 3: divided by 256

bit[0]: interrupt type, 0:edge, 1:level

0x2C

FRC2_INT_ADDRESS

[31:1] 30'b0

frc2_int_clr_mask [0]

1'b0

R/W

write to clear the status of the interrupt, if the

interrupt type is "level"

0x30

FRC2_ALARM_ADDRESS frc2_alarm

[31:0] 32'b0

R/W

the alarm value for the counter

ESP8266 Datasheet(PDF) 116 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.

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