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APPENDIX
Appendix 9. Q & A
Q
Are there precautions when the 7751 Series substitutes for the 7700 Series or the 7750 Series?
A
The common precautions are described below. Refer to the relevant chapter for details.
•Fix the processor status register (PS) bits 15 to 11 to "0." Do not set these bits to "1."
•There are the structure differences in the processor mode register 0 (address 5E
processor mode register 1 (address 5F
•The A-D conversion interrupt request bit (bit 3 at address 70
bit to "0" by software before use.
•Clear the receive enable bit (bit 2 at addresses 35
flag (bit 4 at addresses 35
This is only method that the overrun error flag is cleared to "0"
•There are instructions of which number of the instruction cycle is decreased. Accordingly, it is
possible that the instruction execution timing become faster.
•Part of the electrical characteristics, Ready function, Hold function, and the bus timing are
different.
20–82
).
16
, 3D
) to "0."
16
16
7751 Group User's Manual
Substitute for 7700 Series/7750 Series
) is undefined at reset. Set this
16
, 3D
) to "0" when clearing the overrun error
16
16
) and the
16
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