On-Board Programming; Boot Mode; Table 21.5 On-Board Programming Mode Setting - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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Section 21 Flash Memory (0.18-µm F-ZTAT Version)

On-Board Programming

When the pins are set to on-board programming mode and the reset start is executed, a transition is

made to an on-board programming state in which the on-chip flash memory can be

programmed/erased. On-board programming mode has three operating modes: boot mode, user

program mode, and user boot mode.

For details on the pin setting for entering each mode, see table 21.5. For details of the state

transition of each mode for flash memory, see figure 21.2.

Mode Setting

User program mode

User boot mode

Before downloading a programming/erasing program, the FLSHE bit must be set to 1 to

make a transition to user program mode.

Boot mode executes programming/erasing of the user MAT and user boot MAT by means of the

control commands and program data transmitted from the host via the on-chip SCI. The tool for

transmitting the control commands, and program data must be prepared in the host. The SCI

communication mode is set to asynchronous mode. When reset start is executed after this LSI's

pins have been set to boot mode, the boot program built in the microcomputer beforehand is

initiated. After the SCI bit rate is automatically adjusted, communication with the host is executed

by means of control commands.

A system configuration diagram in boot mode is shown in figure 21.6. For details on the pin

settings in boot mode, see table 21.5. The NMI and other interrupts are ignored in boot mode.

However, the NMI and other interrupts should be disabled within the user system.

Rev. 3.00 Jul. 14, 2005 Page 764 of 986

REJ09B0098-0300

H8s/2100 series H8s/2114r R4f2114r