Section 3 Mcu Operating Modes; Overview; Operating Mode Selection; Register Configuration - Renesas Hitachi H8S/2194 Series Hardware Manual

3.1

Overview

3.1.1

Operating Mode Selection

This LSI has one operating mode (mode 1). This mode is selected depending on settings of the
mode pin (MD0).
Table 3.1 lists the MCU operating modes.
Table 3.1 MCU Operating Mode Selection
MCU Operating Mode
0
1
The CPU's architecture allows for 4 Gbytes of address space, but this LSI actually accesses a
maximum of 16 Mbytes.
Mode 1 operation starts in single-chip mode after reset release.
This LSI can only be used in mode 1. This means that the mode pins must be set at mode 1. Do
not changes the inputs at the mode pins during operation.
3.1.2

Register Configuration

This LSI has a mode control register (MDCR) that indicates the inputs at the mode pin (MD0)
and a system control register (SYSCR) and that controls the operation of this LSI. Table 3.2
summarizes these registers.
Table 3.2 MCU Registers
Name
Mode control register
System control register
Note: Lower 16 bits of the address.
*

Section 3 MCU Operating Modes

MD0 CPU Operating Mode

0
1 Advanced
Abbreviation
MDCR
SYSCR
R/W Initial Value
R/W Undetermined
R/W H'09
Rev. 2.0, 11/00, page 59 of 1037
Description

Single-chip mode
Address*
H'FFE9
H'FFE8