Datasheet

Section 17 Timer RE
REJ09B0465-0300 Rev. 3.00 Page 605 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
Section 17 Timer RE
Timer RE is a timer that provides a realtime clock function to count time ranging from a second to
a week and a compare-match function. Figure 17.1 shows a block diagram of the timer RE.
17.1 Features
• Realtime clock mode
⎯ Counts seconds, minutes, hours, and day-of-week
⎯ Start/stop function
⎯ Reset function
⎯ Readable/writable counter of seconds, minutes, hours, and day-of-week with BCD codes
⎯ Periodic (seconds, minutes, hours, days, and weeks) interrupts
• Output-compare mode
⎯ 8-bit counter with a compare-match function
⎯ Selection of clock source
⎯ Compare-match interrupt