Rev. 1.00, 09/03, page 51 of 704
Section 3 MCU Operating Modes
3.1
Operating Mode Selection
This LSI has four operating modes (modes 1, 3, 5, and 7). These modes are determined by the
mode pin settings (MD2, MD1, and MD0). For normal program execution mode, the mode pins
must be set to mode 7. Do not change the mode pins while in the middle of an operation. Table 3.1
shows the MCU operating mode selection.
Table 3.1
MCU Operating Mode Selection
MCU Operating
Mode MD2
MD1
MD0
CPU Operating
Mode Description
1
0
0
1
Boot mode
Flash memory programming/erasing
3
0 1 1 Emulation
On-chip
emulation
mode
5
1
0
1
User boot mode
Flash memory programming/erasing
7
1
1
1
Advanced
Single-chip mode with on-chip ROM
enable extended mode
Modes 0, 2, 4, and 6 are not available with this LSI.
After a reset in mode 7, the operation is started in single-chip mode. It is possible to shift to
extended mode when the EXPE bit in MDCR is set to 1.
Modes 1 and 5 are boot modes for flash memory programming/erasing. For details, refer to section
20, Flash Memory (0.18-
µ
m F-ZTAT Version).
Mode 3 is on-chip emulation mode. The JTAG interface is controlled by the on-chip emulator, on-
chip emulation is possible.
Summary of Contents for H8S/2437
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