HD64F2357VF13 Datasheet, PDF (85/1049 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 3 MCU Operating Modes
3.1 Overview
3.1.1 Operating Mode Selection (H8S/2357 F-ZTAT Only)
The H8S/2357 F-ZTAT has eight operating modes (modes 4 to 7, 10, 11, 14 and 15). These modes are determined by the
mode pin (MD₂ to MD₀) and flash write enable pin (FWE) settings. The CPU operating mode and initial bus width can be
selected as shown in table 3-1.
Table 3-1 lists the MCU operating modes.
Table 3-1 MCU Operating Mode Selection (H8S/2357 F-ZTAT Only)
MCU
CPU
Operating
Operating
Mode
FWE MD₂ MD₁ MD₀ Mode
Description
0
0000—
—
External Data
Bus
On-Chip Initial Max.
ROM Width Width
—
—
—
1
1
2
10
3
1
4
1 0 0 Advanced On-chip ROM disabled, Disabled 16 bits 16 bits
5
1
expanded mode
8 bits 16 bits
6
10
On-chip ROM enabled, Enabled 8 bits 16 bits
expanded mode
7
1
Single-chip mode
—
—
8
1000—
—
—
—
—
9
1
10
1 0 Advanced Boot mode
Enabled 8 bits 16 bits
11
1
—
—
12
100—
—
—
—
—
13
1
14
1 0 Advanced User program mode Enabled 8 bits 16 bits
15
1
—
—
The CPU's architecture allows for 4 Gbytes of address space, but the H8S/2357 Group actually accesses 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.
Modes 10, 11, 14, and 15 are boot modes and user program modes in which the flash memory can be programmed and
erased. For details, see section 19, ROM.
Rev.6.00 Oct.28.2004 page 55 of 1016
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