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RS5C372A Datasheet(PDF) 47 Page - RICOH electronics devices division |
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RS5C372A Datasheet(HTML) 47 Page - RICOH electronics devices division |
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47 / 59 page  RS5C372A/B 43 4.3 Periodic (Clock) Interrupt The INTRA or INTRB pin (INTR for the RS5C372B) output, the periodic interrupt cycle select bits (CT2, CT1, CT0) and the interrupt output select bits (SL2, SL1) can be used to interrupt the CPU in a certain cycle. The periodic interrupt cycle select bits can be used to select either one of two interrupt output modes: the pulse mode and the level mode. Interrupt Cycle Selection CT2 CT1 CT0 Description Wave From Mode Cycle and Falling Timing 0 0 0 — OFF (Default) 0 0 1 — Fixed at “L” 0 1 0 Pulse mode 2Hz (Duty50%) 0 1 1 Pulse mode 1Hz (Duty50%) 1 0 0 Level mode Every second (coincident with second count-up) 1 0 1 Level mode Every minute (at 00 second) 1 1 0 Level mode Every hour (at 00:00 on the hour) 1 1 1 Level mode Every month (1st day, 00:00:00 a.m.) 1) Pulse mode : Outputs 2Hz, 1Hz clock pulses. For relationships with counting up of seconds see the diagram below. *) When 32.000kHz crystal is used, In the 2Hz clock pulse mode, 0.496s clock pulses and 0.504s clock pulse are output alternately. Duty cycle for 1Hz clock pulses becomes 50.4% (“L” duration is 0.496s while “H” duration is 0.504s). 4.2-2 Alarm Interrupt (RS5C372B) For setting an alarm time, designated time such as day-of-the-week, hour or minute should be set to the alarm regis- ters being AALE (BALE) bit to 0. After that set the AALE (BALE) bit to 1, from this moment onward when such registered alarm time coincide the value of calendar counter the INTR comes down to “L” (ON). The INTR output can be controlled by operating to the AALE (BALE) and AAFG (BAFG) bits. Alarm-calendar coincidence period (1 min.) Day-of- the-week, time matched Day-of- the-week, time matched Day-of- the-week, time matched Day-of- the-week, time matched INTR INTR AALE ←1 (BALE) AALE ←1 (BALE) AALFG ←0 (BAFG) AALE ←0 (BALE) AALE ←0 (BALE) AALE ←1 (BALE) A A : MAX.61.1 µs (MAX. 62.5 µs when 32.000kHz crystal is used.) *) Note that AAFG (BAFG) has an output wave form of reversed logic. |
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