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The CPU's architecture allows for 4 Gbytes of address space, but the H8S/2318 F-ZTAT,
H8S/2317 F-ZTAT, H8S/2315 F-ZTAT, and H8S/2314 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.
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 17, ROM.
The H8S/2318 F-ZTAT, H8S/2317 F-ZTAT, H8S/2315 F-ZTAT, and H8S/2314 F-ZTAT can
only be used in modes 4 to 7, 10, 11, 14, and 15. This means that the flash write enable pin and
mode pins must be set to select one of these modes.
Do not change the inputs at the mode pins during operation.
3.1.2
Operating Mode Selection (Mask ROM, ROMless, H8S/2319 F-ZTAT, and
H8S/2319C F-ZTAT)
The ROMless and mask ROM versions have four operating modes (modes 4 to 7). The H8S/2319
F-ZTAT has six operating modes (modes 2 to 7). The H8S/2319C F-ZTAT has seven operating
mode (modes 1 to 7). The operating mode is determined by the mode pins (MD2 to MD0). The
CPU operating mode, enabling or disabling of on-chip ROM, and the initial bus width setting can
be selected as shown in table 3-2.
Table 3-2 lists the MCU operating modes.
Rev. 5.00, 12/03, page 70 of 1088
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