SH7146 Datasheet, PDF (93/1022 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 3 MCU Operating Modes
Section 3 MCU Operating Modes
3.1 Selection of Operating Modes
This LSI has four MCU operating modes and three on-chip flash memory programming modes.
The operating mode is determined by the setting of FWE, MD1, and MD0 pins. Table 3.1 shows
the allowable combinations of these pin settings; do not set these pins in the other way than the
shown combinations.
When power is applied to the system, be sure to conduct power-on reset.
The MCU operating mode can be selected from MCU extension modes 0 to 2 and single chip
mode. For the on-chip flash memory programming mode, boot mode, user boot mode, and user
program mode which are on-chip programming modes are available.
Table 3.1 Selection of Operating Modes
Pin Setting
Bus Width of CS0 Space
Mode No. FWE MD1 MD0*¹ Mode Name On-Chip ROM SH7146
SH7149
Mode 0 0
0
0
MCU extension Not active

8
mode 0
Mode 1 0
0
1
MCU extension Not active

16
mode 1
Mode 2 0
1
0
MCU extension Active

mode 2
Set by CS0BCR in BSC
Mode 3 0
1
1
Single chip
Active


mode
Mode 4*² 1
0
0
Boot mode
Active


Mode 5*² 1
0
1
User boot
Active

mode
Set by CS0BCR in BSC
Mode 6*² 1
1
0
User
Active

Mode 7*² 1
1
1
programming
—
mode
Set by CS0BCR in BSC
—
Notes: 1. The SH7146 does not have the MD0 pin and only supports the following operating
modes according to the combination of the FWE and MD1 pins.
Single chip mode: FWE pin = 0 and MD1 pin = 1
Boot mode: FWE pin = 1 and MD1 pin = 0
User programming mode: FWE pin= 1 and MD1 pin = 1
2. Flash memory programming mode.
Rev. 3.00 May 17, 2007 Page 49 of 974
REJ09B0229-0300