D12320VF25IV Datasheet, PDF (111/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 3 MCU Operating Modes
Table 3.2 MCU Operating Mode Selection (Mask ROM and ROMless Versions,
H8S/2329B F-ZTAT)
MCU
CPU
Operating
Operating
Mode
MD2 MD1 MD0 Mode
Description
External Data Bus
On-Chip Initial
ROM Value
Max.
Value
1
001—
—
—
—
—
2^*1
10
3^*1
1
4^*2
1 0 0 Advanced Expanded mode with Disabled 16 bits 16 bits
5^*2
1
on-chip ROM disabled
8 bits
16 bits
6
10
Expanded mode with Enabled 8 bits
16 bits
on-chip ROM enabled
7
1
Single-chip mode
—
—
Notes: 1. Boot mode in the H8S/2329B F-ZTAT.
See table 19.9, for information on H8S/2329B F-ZTAT user boot modes. See table
19.9, for information on H8S/2329B F-ZTAT user program modes.
2. The ROMless versions can use only modes 4 and 5.
The CPU's architecture allows for 4 Gbytes of address space, but the mask ROM and ROMless
versions, and H8S/2329B F-ZTAT actually access a maximum of 16 Mbytes.
Modes 4 to 6 are externally expanded modes that allow access to external memory and peripheral
devices.
The external expansion modes allow switching between 8-bit and 16-bit bus modes. After
program execution starts, an 8-bit or 16-bit address space can be set for each area, depending on
the bus controller setting. If 16-bit access is selected for any one area, 16-bit bus mode is set; if 8-
bit access is selected for all areas, 8-bit bus mode is set. Note that the functions of each pin depend
on the operating mode.
The ROMless and mask ROM versions can only be used in modes 4 to 7. This means that the
mode pins must be set to select one of these modes. However, note that only mode 4 or 5 can be
set for the ROMless version.
H8S/2329B F-ZTAT can only be used in modes 2 to 7. This means that the mode pins must be set
to select one of these modes.
Do not change the inputs at the mode pins during operation.
Rev.6.00 Sep. 27, 2007 Page 79 of 1268
REJ09B0220-0600