h8s-2158 Renesas Electronics Corporation., h8s-2158 Datasheet - Page 107

• Manufacturer Part Number: h8s-2158
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

3.1
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
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
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).
MCU
Operating
Mode
2
3
Mode control register (MDCR)
System control register (SYSCR)
Serial timer control register (STCR)
Operating Mode Selection
Register Descriptions
MD2
MD2 MD1 MD0
1
1
MD2
MD2
MCU Operating Mode Selection
1
1
Section 3 MCU Operating Modes
0
1
CPU
Operating
Mode
Advanced
mode
Normal
mode
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
Section 3 MCU Operating Modes
REJ09B0286-0300
On-Chip ROM
Enabled
Enabled