External Bus Status When Internal Area Accessed - Renesas M16C/62P Series Hardware Manual

M16C/62P Group (M16C/62P, M16C/62PT)
8.2.9

External Bus Status When Internal Area Accessed

Table 8.7 shows the External Bus Status When Internal Area Accessed.
Table 8.7 External Bus Status When Internal Area Accessed
Item
A0 to A19
D0 to D15 When Read
When Write
RD, WR, WRL, WRH
BHE
CS0 to CS3
ALE
Rev.2.41 Jan 10, 2006
REJ09B0185-0241
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SFR Accessed
Address output
High-impedance
Output data
RD, WR, WRL, WRH output
BHE output
Output "H"
Output "L"
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Internal ROM, RAM Accessed
Maintain status before accessed
address of external area or SFR
High-impedance
Undefined
Output "H"
Maintain status before accessed status
of external area or SFR
Output "H"
Output "L"
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8. Bus