HD6473032F16 Datasheet, PDF (147/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 6 Bus Controller
Bit 5—Address 21 Enable (A21E): Enables PA₆ to be used as the A₂₁ address output pin.
Writing 0 in this bit enables A₂₁ address output from PA₆. In modes other than 3, 4, and 6 this bit
cannot be modified and PA₆ has its ordinary input/output functions.
Bit 5: A21E
0
1
Description
PA6 is the A21 address output pin
PA6 is the PA6/TP6/TIOCA2 input/output pin
(Initial value)
Bits 4 to 1—Reserved: Read-only bits, always read as 1.
Bit 0—Bus Release Enable (BRLE): Enables or disables release of the bus to an external device.
Bit 0: BRLE
0
1
Description
The bus cannot be released to an external device; BREQ and BACK can be
used as input/output pins
(Initial value)
The bus can be released to an external device
Rev. 3.00 Mar 21, 2006 page 117 of 814
REJ09B0302-0300