HD64F3437TF16 Datasheet, PDF (742/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

Appendix D Port States in Each Processing State
Table D.1 Port States
Port Name
(Multiplexed
Pin Names) Mode
P1₇ to P1₀ 1
A₇ to A₀
2
Reset
L
T
Hardware
Standby
Mode
T
3
P2₇ to P2₀ 1
L
T
A₁₅ to A₈
2
T
3
P3₇ to P3₀ 1
T
T
D₇ to D₀
2
3
P4₇ to P4₀ 1
T
T
2
3
P5₂ to P5₀ 1
T
T
2
3
P6₇ to P6₀ 1
T
T
2
3
P7₇ to P7₀ 1
T
T
2
3
Software
Standby Mode Sleep Mode
L
keep^*1
(DDR = 1)
L
(DDR = 0)
keep
keep
L
keep^*1
(DDR = 1)
L
(DDR = 0)
keep
keep
T
T
Program
Execution
State (Normal
Operation)
A₇ to A₀
Address/
input port
I/O port
A₁₅ to A₈
Address/
input port
I/O port
D₇ to D₀
keep
keep^*2
keep
keep
I/O port
I/O port
keep^*2
keep
I/O port
keep^*2
keep
I/O port
T
T
Input port
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