HD6432646 Hitachi, HD6432646 Datasheet - Page 187

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Bits 3 to 0—Address Output Enable 3 to 0 (AE3–AE0): These bits select enabling or disabling
of address outputs A8 to A23 in ROMless expanded mode and modes with ROM. When a pin is
enabled for address output, the address is output regardless of the corresponding DDR setting.
When a pin is disabled for address output, it becomes an output port when the corresponding DDR
bit is set to 1.
Bit 3
AE3
0
1
Note: * In expanded mode with ROM, bits AE3 to AE0 are initialized to B'0000.
In ROMless expanded mode, bits AE3 to AE0 are initialized to B'1101.
Address pins A0 to A7 are made address outputs by setting the corresponding DDR bits to
1.
Bit 2
AE2
0
1
0
1
Bit 1
AE1
0
1
0
1
0
1
0
1
Bit 0
AE0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Description
A8–A23 address output disabled
A8 address output enabled; A9–A23 address output disabled
A8, A9 address output enabled; A10–A23 address output
disabled
A8–A10 address output enabled; A11–A23 address output
disabled
A8–A11 address output enabled; A12–A23 address output
disabled
A8–A12 address output enabled; A13–A23 address output
disabled
A8–A13 address output enabled; A14–A23 address output
disabled
A8–A14 address output enabled; A15–A23 address output
disabled
A8–A15 address output enabled; A16–A23 address output
disabled
A8–A16 address output enabled; A17–A23 address output
disabled
A8–A17 address output enabled; A18–A23 address output
disabled
A8–A18 address output enabled; A19–A23 address output
disabled
A8–A19 address output enabled; A20–A23 address output
disabled
A8–A20 address output enabled; A21–A23 address output
disabled
A8–A21 address output enabled; A22, A23 address output
disabled
A8–A23 address output enabled
(Initial value*)
(Initial value*)
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