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Q
Is there any precaution when f(X
A
When setting the CPU running speed select bit (bit 3 at address 5F
ROM access become faster than this bit is "0." Accordingly, we recommend to set this bit to
"1."
However, do not set bits 5 to 3 at address 5F
to "1," set bit 5, bit 4, or both bits 5 and 4 to "1" at the same time because bits 5 and 4 at
address 5F
become "00
16
b7
1
0 0
) ≤ 25 MHz ?
IN
" at reset.
2
b0
0
0
Fix these bits to "0."
Clock source for peripheral devices
0 : φ divided by 2
1 : φ
Bus cycle when accessing external device
Set these bits to "01
(Not selected "00
b5 b4
0 0 : 4 φ
0 1 : 3 φ
1 0 : 2 φ
Fix these bits to "0."
7751 Group User's Manual
to "001
." When setting bit 3 at address 5F
16
2
," "10
," "11
."
2
2
2
.")
2
APPENDIX
Appendix 9. Q & A
) to "1," SFR and internal
16
Clock
16
20–81
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