Datasheet

Section 3 MCU Operating Modes
Rev. 3.00 Sep. 28, 2009 Page 51 of 710
REJ09B0384-0300
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 and MD1). Table 3.1 shows the MCU operating mode
selection.
Table 3.1 MCU Operating Mode Selection
MCU Operating
Mode
MD2 MD1
CPU Operating
Mode
Description
2 1 1 Advanced Extended mode with on-chip ROM
Single-chip mode
4 0 0 ⎯ Flash programming/erasing
6 0 1 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.