Rev. 1.0, 02/00, page 61 of 1141
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
Undetermined
H'FFE9
System control register
SYSCR
R/W
H'09
H'FFE8
Note:
*
Lower 16 bits of the address.