HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 767

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

19.2.2
Enabling or disabling of part of the on-chip ROM area in the chip can be selected by means of the
EAE bit in BCRL. For details of the other bits in BCRL, see section 6.2.5, Bus Control Register L
(BCRL).
Bit 5—External Address Enable (EAE): Selects whether addresses H'010000 to H'03FFFF *
to be internal addresses or external addresses.
Bit 5
0
1
Notes: 1. Do not access a reserved area.
19.3
The on-chip ROM is connected to the CPU by a 16-bit data bus, and both byte and word data can
be accessed in one state. Even addresses are connected to the upper 8 bits, and odd addresses to
the lower 8 bits. Word data must start at an even address.
The on-chip ROM is enabled and disabled by setting the mode pins (MD2 to MD0) and the EAE
bit in BCRL. These settings are shown in tables 19.2 and 19.3.
Bit
Initial value :
R/W
2. Addresses H'010000 to H'05FFFF in the H8S/2329B.
3. H8S/2328B in flash memory version.
Bus Control Register L (BCRL)
Operation
H8S/2329B, H8S/2328 *
H8S/2326
On-chip ROM
Addresses H'010000 to H'03FFFF *
or reserved area *
Addresses H'010000 to H'07FFFF in the H8S/2326.
:
:
BRLE
R/W
7
0
BREQOE
1
R/W
in single-chip mode
6
0
3
,
EAE
R/W
H8S/2327
Addresses H'010000 to
H'01FFFF are on-chip
ROM or address H'020000
to H'03FFFF are reserved
area *
5
1
1
2
are external addresses in external expanded mode
Description
R/W
—
4
1
Rev.6.00 Sep. 27, 2007 Page 737 of 1268
DDS
R/W
3
1
H8S/2323
Reserved area *
R/W
—
2
1
REJ09B0220-0600
WDBE
Section 19 ROM
(Initial value)
R/W
1
0
1
WAITE
R/W
0
0
2
are