Section 20 Realtime Clock (RTC)
Rev.1.00 Dec. 13, 2005 Page 728 of 1286
REJ09B0158-0100
20.4.2
Time Reading Procedures
Figure 20.3 shows examples of the time reading procedures.
No
No
Yes
Yes
No
No
Yes
Yes
(a) Reading time without using interrupts
(b) Reading time using interrupts
Clear RCR1.CF to 0
(Write 1 to RCR1.AF so that alarm flag
is not cleared).
Clear RCR1.CIE to 0.
Clear RCR1.CF to 0
(Write 1 to RCR1.AF so that alarm flag
is not cleared).
Set RCR1.CIE to 1.
Clear RCR1.CIE to 0.
Note:
*
When H'59 is read out from the second counter register, that
should be changed to H'00 and the read out value of the minute
counter register should be added to 1 as a carry processing.
The hour counter, day-of-week, day, month, and year counters
may be necessary to do carry processing.
Read RCR1 register and check CF bit.
Clear carry flag
Read counter register
Disable carry interrupts
Clear carry flag
Enable carry interrupts
Interrupt generated?
Clear carry flag
Disable carry interrupts
Read counter register
CRF = 1?
CRF = 1?
Add 1 (second) to the second
counter register value that is
read out
*
Add 1 (second) to the second
counter register value that is
read out
*
CF = 1?
Figure 20.3 Examples of Time Reading Procedures
Содержание SH7780 Series
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