Datasheet

Section 6 Bus Controller (BSC)
Rev. 2.00 Aug. 20, 2008 Page 119 of 1198
REJ09B0403-0200
(d) Glueless Extension
Setting the OBE bit in PTCNT0 selects glueless extension, which uses the RD, WR, HBE, and
LBE signals to allow connection to the external space without adding an external circuit.
Table 6.2 Address Ranges and External Address Spaces
Area
Address Range Basic Extended Area 256-Kbyte Extended Area
H'080000 to H'F7FFFF
(15 Mbytes)
: No condition 
H'F80000 to H'FBFFFF
(256 Kbytes)
256-Kbyte extended area
∆: When CS256E = 0, used as
basic extended area.
When WAIT pin function is not
selected while CS256E = 1,
CS256 is output and address
pins A17 to A0 are used.
H'FC0000 to H'FEFFFF
(192 Kbytes)
: No condition 
H'FF0800 to H'FFBFFF
(46 Kbytes)
∆: When RAME = 0, used as
basic extended area.

H'FFC000 to H'FFDFFF
(8 Kbytes)
: No condition 
H'FFE000 to H'FFE07F
(128 bytes)
: No condition. 
H'FFE080 to H'FFEFFF
(3968 bytes)
∆: When RAME = 0, used as
basic extended area.

H'FFF000 to H'FFF7FF
(2 Kbytes)
No condition
When IOSE = 1, IOS is
output and address pins A10
to A0 are used.

H'FFFF00 to H'FFFF7F
(128 bytes)
∆ When RAME = 0, used as
basic extended area.

[Legend]
: This address range is unconditionally accessed as the basic extended area.
∆: Condition for making this address range accessed as the basic extended area.
: This address range cannot be used as part of a 256-Kbyte extended area.