H8S2112 Datasheet, PDF (89/894 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family / H8S/2100 Series

Section 3 MCU Operating Modes
Section 3 MCU Operating Modes
3.1 Operating Mode Selection
This LSI 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
CPU Operating
Mode
MD2 MD1 MD0* Mode
Description
On-Chip ROM
2
010
Advanced
Single-chip mode
Enabled
4
100

Flash memory

programming/erasing
6
110
Emulation
On-chip emulation mode Enabled
Note: * MD0 is not available as a pin and is internally fixed to 0.
Modes 2 is single-chip mode.
Modes 0, 1, 3, 5 and 7 are not available in this LSI. Modes 4 and 6 are operating modes for a
special purpose. Thus, mode pins should be set to enable mode 2 in the normal program execution
state. Mode pin settings should not be changed during operation. After a reset is canceled, the
mode pin inputs should be latched by reading MDCR.
Mode 4 is a boot mode for programming or erasing the flash memory. For details, see section 22,
Flash Memory.
Mode 6 is an on-chip emulation mode. In this mode, this LSI is controlled by an on-chip emulator
(E10A) via the JTAG, thus enabling on-chip emulation.
Rev. 1.00 Mar. 18, 2008 Page 65 of 866
REJ09B0451-0100