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SH7243 Datasheet(PDF) 93 Page - Renesas Technology Corp

Part # SH7243
Description  Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family
PDF  1726 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7243 Datasheet(HTML) 93 Page - Renesas Technology Corp

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Section 3 MCU Operating Modes
Rev. 1.00 Jun. 26, 2008 Page 63 of 1692
REJ09B0393-0100
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
Mode Name
On-Chip ROM
SH7286 SH7285 SH7284
Mode 0
0
0
0
MCU extension mode 0
Not active
32
16
16
Mode 1
0
0
1
MCU extension mode 1
Not active
16
8
8
Mode 2
0
1
0
MCU extension mode 2
Active
Set by CS0BCR in BSC
Mode 3
0
1
1
Single chip mode
Active
Mode 4
*1
1
0
0
Boot mode
Active
Set by CS0BCR in BSC
Mode 5
*1
1
0
1
User boot mode
Active
Set by CS0BCR in BSC
Mode 6
*1
1
1
0
User programming mode
Active
Set by CS0BCR in BSC
Mode 7
*1*2
1
1
1
USB boot mode
Active
—
Mode 7
*1*4
1
1
1
User Programming mode
Active
—
Notes: 1. Flash memory programming mode.
2. Setting mode is prohibited in the SH7243.
3. When always FWE = 1, after the power has been on.
4. If FWE = 0 when power-on reset has been released, and if FWE = 1 when the MCU
operation has been set, transition to the user programming mode is executed in a single
chip state.



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