Epson RTC-72421 A Manuel D’Utilisation

RTC - 72421 / 72423 

 

 

Page - 14 

MQ - 162 - 03 

 

 

„ Using the RTC-72421/RTC-72423 

 
1. Power-on procedure (initialization)

 

 
When power is turned on, the contents of all registers and the output from the STD.P pin are undefined. Therefore, all the registers 
must be initialized after power on. Follow the procedure given below for initialization. 
 

Power On

Start the counter

Initialize the control registers

To next process

Check the status of the BUSY bit

STOP and RESET the counter

Set the current time in the registers

(initialize the S

1

 to W registers)

Start the counter and release

the HOLD status

(A)

(B)

(C)

(A)

At ths point, there is no need to
check the BUSY bit.

From here on, check the status of the
BUSY bit before accessing any of the
registers, except for the C

D

, C

E

 and C

F

control register.

 

 

   

 

 

 

For details of processes (A) to (C), see next page.