HD64F2357VF13 Datasheet, PDF (594/1049 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

19.2 Register Descriptions
19.2.1 Mode Control Register (MDCR)
Bit
:
7
6
5
4
—
—
—
—
Initial value :
1
0
0
0
R/W
:—
—
—
—
Note: * Determined by pins MD₂ to MD₀.
3
2
1
0
—
MDS2 MDS1 MDS0
0
—*
—*
—*
—
R
R
R
MDCR is an 8-bit read-only register that indicates the current operating mode of the H8S/2357 Group.
Bit 7—Reserved: This bit cannot be modified and is always read as 1.
Bits 6 to 3—Reserved: These bits cannot be modified and are always read as 0.
Bits 2 to 0—Mode Select 2 to 0 (MDS2 to MDS0): These bits indicate the input levels at pins MD₂ to MD₀ (the current
operating mode). Bits MDS₂ to MDS₀ correspond to pins MD₂ to MD₀. MDS2 to MDS0 are read-only bits, and cannot be
written to. The mode pin (MD₂ to MD₀) input levels are latched into these bits when MDCR is read. These latches are
canceled by a power-on reset, but are retained after a manual reset*.
Note: * Manual reset is only supported in the H8S/2357 ZTAT.
19.2.2 Bus Control Register L (BCRL)
Bit
:
Initial value :
R/W
:
7
6
BRLE BREQOE
0
0
R/W
R/W
5
EAE
1
R/W
4
LCASS
1
R/W
3
DDS
1
R/W
2
1
0
— WDBE WAITE
1
0
0
R/W
R/W
R/W
Enabling or disabling of part of the H8S/2357’s on-chip ROM area 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'01FFFF*² are to be internal addresses
or external addresses.
Bit 5
EAE
Description
0
Addresses H'010000 to H'01FFFF*² are in on-chip ROM
1
Addresses H'010000 to H'01FFFF*² are external addresses (external expansion
mode)
or a reserved area*¹ (single-chip mode).
(Initial value)
Notes: 1. Reserved areas should not be accessed.
2. Addresses H'010000 to H'01FFFF are in the H8S/2357. Addresses H'010000 to H'03FFFF are in the H8S/2398.
Rev.6.00 Oct.28.2004 page 564 of 1016
REJ09B0138-0600H