Section 3 Mcu Operating Modes; Operating Mode Selection; Register Descriptions; Table 3.1 Mcu Operating Mode Selection - Renesas H8S/2158 User Manual

3.1

Operating Mode Selection

This LSI supports two operating modes (modes 2 and 3). 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
MD2 MD2 MD1 MD0 MD2 MD2
Mode
2 1 1
3 1 1
Modes 2 and 3 are single-chip mode after a reset. The CPU can switch to extended mode by
setting bit EXPE in MDCR to 1.
Modes 0, 1, and 5 cannot be used in this LSI. Modes 4, 6, and 7 are specific modes. Thus, mode
pins should be set to enable mode 2 or 3 in normal program execution state. Mode pins should not
be changed during operation.
Mode 4 is a boot mode to write/erase the flash memory. For details, see section 24, ROM.
Modes 6 and 7 are on-chip emulation modes. These modes are controlled by the on-chip emulator
(E10A) via the JTAG interface, and on-chip emulation can be performed.
3.2

Register Descriptions

The following registers are related to the operating mode. For details on the bus control register
(BCR), see section 6.3.1, Bus Control Register (BCR), and for details on bus control register 2
(BCR2), see section 6.3.2, Bus Control Register 2 (BCR2).
• Mode control register (MDCR)
• System control register (SYSCR)
• Serial timer control register (STCR)

Section 3 MCU Operating Modes

CPU
Operating
Mode
0 Advanced
mode
1 Normal
mode
Section 3 MCU Operating Modes
Description
Extended mode with on-chip ROM
Single-chip mode
Extended mode with on-chip ROM
Single-chip mode
Rev. 3.00 Jan 25, 2006 page 55 of 872
On-Chip ROM
Enabled
Enabled
REJ09B0286-0300