Time Reading Procedures - Hitachi SH7750 Hardware Manual

Sh7750 series superh risc engine

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The procedure for setting the time while the clock is running is shown in (b). This method is

useful for modifying only certain counter values (for example, only the second data or hour data).

If a carry occurs during the write operation, the write data is automatically updated and there will

be an error in the set data. The carry flag should therefore be used to check the write status. If the

carry flag (RCR1.CF) is set to 1, the write must be repeated.

The interrupt function can also be used to determine the carry flag status.

Time Reading Procedures

Figure 11.3 shows examples of the time reading procedures.

Rev. 6.0, 07/02, page 286 of 986

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