Renesas Hitachi H8S/2191, Hardware Manual

Page: 86 / 1065

Rev. 2.0, 11/00, page 59 of 1037
Section 3 MCU Operating Modes
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 MD0 CPU Operating Mode Description
0 0
 
1 1 Advanced Single-chip mode
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 Abbreviation R/W Initial Value Address *
Mode control register MDCR R/W Undetermined H'FFE9
System control register SYSCR R/W H'09 H'FFE8
Note: * Lower 16 bits of the address.