Mcu Operating Modes; Overview; Operating Mode Selection - Hitachi H8/3048 Hardware Manual

Single-chip microcomputer

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The H8/3048 Series has seven operating modes (modes 1 to 7) that are selected by the mode pins

) as indicated in table 3-1. The input at these pins determines the size of the address

space and the initial bus mode.

Table 3-1 Operating Mode Selection

Notes: 1. In modes 1 to 6, an 8-bit or 16-bit data bus can be selected on a per-area basis by

settings made in the area bus width control register (ABWCR). For details see

section 6, Bus Controller.

2. If the RAME bit in SYSCR is cleared to 0, these addresses become external addresses.

For the address space size there are two choices: 1 Mbyte or 16 Mbytes. The external data bus is

either 8 or 16 bits wide depending on ABWCR settings. If 8-bit access is selected for all areas, the

external data bus is 8 bits wide. For details see section 6, Bus Controller.

Modes 1 to 4 are externally expanded modes that enable access to external memory and peripheral

devices and disable access to the on-chip ROM. Modes 1 and 2 support a maximum address space

of 1 Mbyte. Modes 3 and 4 support a maximum address space of 16 Mbytes.

Section 3 MCU Operating Modes

Address Space

Expanded mode

Single-chip advanced