Datasheet

Section 3 MCU Operating Modes
Rev. 2.00 Sep. 28, 2009 Page 55 of 870
REJ09B0429-0200
Section 3 MCU Operating Modes
3.1 Operating Mode Selection
This MCU supports three operating modes (modes 2, 4, and 6). The operating mode is determined
by the setting of the mode pins (MD2, MD1, and MD0). Table 3.1 shows the MCU operating
mode selection.
Table 3.1 MCU Operating Mode Selection
MCU
Operating
Mode MD2 MD1 MD0
CPU
Operating
Mode Description
2 1 1 0 Advanced Extended mode with on-chip ROM
Single-chip mode
4 0 0 0 — Flash programming/erasing
6 0 1 0 Emulation On-chip emulation mode
Mode 2 is single-chip mode after a reset. The CPU can switch to extended mode by setting bit
EXPE in MDCR to 1.
Modes 0, 1, 3, 5, and 7 are not available in this LSI. Modes 4 and 6 are operating mode for a
special purpose. Thus, mode pins should be set to enable mode 2 in normal program execution
state. Mode pins should not be changed during operation.