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RTC-72421/72423
■ Examples of connection to general-purpose microprocessor
When connecting the RTC-72421/RTC-72423 to a microprocessor, carefully check the AC timings of both the RTC and
the microprocessor.
1. Connection to multiplexed bus type
The resistors on the RD and WR lines are not necessary if the CPU does not have a HALT or HOLD state.
2. Connection to Z80 or compatible CPU 3. Connection to 68-series MPU
* Select IORQ or MEMRQ depending on whether the RTC maps
I/O or memory of the CPU.
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