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2015-12-0001

PT0280-8

12/11/15

14

PT7C43390/43390C

Real-time Clock Module

Example of Output from INT1 and INT2 Registers (Data Register for Output Frequency)

3.5. Clock Correction Register

The clock correction register is a 1-byte register that is used to correct advance / delay of the clock. When not using this function,

set this register to "00h". Regarding the register values, refer to "Function to Clock Correction".

V0

V1

V2

V3

V4

V5

V6

V7

B7

B6

B5

B4

B3

B2

B1

B0

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W : Read/Write

3.6. Free Register

This free register is a 1-byte SRAM type register that can be set freely by users.

V0

V1

V2

V3

V4

V5

V6

V7

B7

B6

B5

B4

B3

B2

B1

B0

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/W : Read/Write

4. Power-on Detection Circuit and Register Status

The power-on detection circuit operates by power-on the RTC, as a result each register is cleared; each register is set as follows.

Real-time data register: 00 (Y), 01 (M), 01 (D), 0 (day of the week), 00 (H), 00 (M), 00 (S)

Status register 1: "01h"

Status register 2: "80h"

INT register 1: "80h"

INT register 2: "00h"

Clock correction register: "00h"

Free register: "00h"

"1" is set in the POC flag (B0 in the status register 1) to indicate that power has been applied. To correct the oscillation frequency,

the status register 2 goes in the mode the output of user-set frequency, so that 1 Hz clock pulse is output from the INT pin. When

"1" is set in the POC flag, be sure to initialize. The POC flag is set to "0" due to initialization so that the output of user-set

frequency mode is cleared. (Refer to "Register Status After Initialization".)