Mcu Operating Modes; Overview; Operating Mode Selection - Hitachi H8/3062 Hardware Manual

Single-chip microcomputer

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The H8/3062 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.

Operating Mode Selection

Notes: 1. In modes 1 to 5, 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 three choices: 64 kbytes, 1 Mbyte, or 16 Mbyte. The external

data bus is either 8 or 16 bits wide depending on ABWCR settings. 8-bit bus mode is used only if

8-bit access is selected for all areas. 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

Setting prohibited

Expanded mode

Single-chip normal mode

Single-chip advanced

Initial Bus On-Chip