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XC68341 Datasheet(PDF) 10 Page - Motorola, Inc |
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XC68341 Datasheet(HTML) 10 Page - Motorola, Inc |
10 / 21 page MOTOROLA MC68341 USER’S MANUAL ADDENDUM 9 25. Additional Note on PORTA/B Output Timing Add to the External Bus Interface Operation description on page 4-17: The Port A and Port B output pins tran- sition after the S4 falling edge for the internal write to the respective data register. This places port pin transi- tions at roughly the same time DS negates for the data register write - note this output delay is not currently specified in the Electrical Specifications. 26. RTC Memory Map The RTC register offsets shown on page 4-21 are incorrect - a corrected memory map is shown below. Ad- dresses within the RTC can be accessed as either bytes or words, with the exception of the reserved byte at offset $0CE. Note that RTC registers marked S/U are read/write in supervisor mode, but can only be read in user mode. 27. MBAR Register Reset Values On page 4-22, the reset values for MBAR bits 31-12 are undefined. 28. MBAR AS7 Bit and IACK Cycles On page 4-23, the second code sequence initializes the MBAR register with AS7 set. This prevents the ad- dress decode for the internal 4K register block from responding to CPU space accesses. In particular, it pre- vents the register block decode of $FFFFFxxx from interfering with IACK cycles (address $FFFFFFFx), and possibly corrupting the vector number returned. Normal interrupt acknowledge operation for the internal mod- ules is not affected by this change. Early versions of the MC68330 User’s Manual (original release) and MC68340 User’s Manual (original and Rev. 1 releases) did not show AS7 set. Code which was developed based on these manual revisions should be checked for this problem when porting to the MC68341 - this change should also be applied back to the MC68330 and/or MC68340. 29. Additional Note on VCO Overshoot On page 4-30 place the following note under the Y-bits description: ADDR FC 15 8 ADDR FC 7 0 0C0 S RTC INTERRUPT CONTROL (RICR) 0C2 S/U MINUTES (MIN) 0C3 S/U SECONDS (SEC) 0C4 S/U DATE 0C5 S/U HOUR 0C6 S/U MONTH 0C7 S/U YEAR 0C8 S RTC CONTROL/STATUS (RCR) 0C9 S/U DAY 0CA S/U MINUTES ALARM (MINA) 0CB S/U SECONDS ALARM (SECA) 0CC S/U DATE ALARM (DATEA) 0CD S/U HOURS ALARM (HOURA) 0CE - RESERVED 0CF S RTC CALIBRATION (RCCR) |
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