Rev.6.00 Oct.28.2004 page 55
of 1016
REJ09B0138-0600H
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 (MD
2
to MD
0
) 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
External Data
Bus
Operating
Mode
FWE MD
2
MD
1
MD
0
Operating
Mode
Description
On-Chip
ROM
Initial
Width
Max.
Width
0
0
0
0
0
—
—
—
—
—
1
1
2
1
0
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
1
0
On-chip ROM enabled,
expanded mode
Enabled 8 bits
16 bits
7
1
Single-chip mode
—
—
8
1
0
0
0
—
—
—
—
—
9
1
10
1
0
Advanced Boot mode
Enabled 8 bits
16 bits
11
1
—
—
12
1
0
0
—
—
—
—
—
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.
Содержание ZTAT H8S/2357F
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Страница 1047: ...H8S 2357 Group H8S 2357F ZTATTM H8S 2398F ZTATTM Hardware Manual 2 6 2 Ote machi Chiyoda ku Tokyo 100 0004 Japan...