HD6417750RF240V Datasheet, PDF (500/606 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 18 ROM
18.6.1 Boot Mode
Table 18.4 shows the boot mode operations between reset end and branching to the programming
control program.
1. When boot mode is used, the flash memory programming control program must be prepared in
the host beforehand. Prepare a programming control program in accordance with the
description in section 18.8, Flash Memory Programming/Erasing.
2. SCI_2 should be set to asynchronous mode, and the transfer format as follows: 8-bit data, 1
stop bit, and no parity.
3. When the boot program is initiated, the chip measures the low-level period of asynchronous
SCI communication data (H'00) transmitted continuously from the host. The chip then
calculates the bit rate of transmission from the host, and adjusts the SCI_2 bit rate to match
that of the host. The reset should end with the RxD pin high. The RxD and TxD pins should be
pulled up on the board if necessary. After the reset is complete, it takes approximately 100
states before the chip is ready to measure the low-level period.
4. After matching the bit rates, the chip transmits one H'00 byte to the host to indicate the
completion of bit rate adjustment. The host should confirm that this adjustment end indication
(H'00) has been received normally, and transmit one H'55 byte to the chip. If reception could
not be performed normally, initiate boot mode again by a reset. Depending on the host's
transfer bit rate and system clock frequency of this LSI, there will be a discrepancy between
the bit rates of the host and the chip. To operate the SCI properly, set the host's transfer bit rate
and system clock frequency of this LSI within the ranges listed in table 18.5.
5. In boot mode, a part of the on-chip RAM area is used by the boot program. The area H'FFE800
to H'FFEFBF is the area to which the programming control program is transferred from the
host. The boot program area cannot be used until the execution state in boot mode switches to
the programming control program.
6. Before branching to the programming control program, the chip terminates transfer operations
by SCI_2 (by clearing the RE and TE bits in SCR to 0), however the adjusted bit rate value
remains set in BRR. Therefore, the programming control program can still use it for transfer of
write data or verify data with the host. The TxD pin is high. The contents of the CPU general
registers are undefined immediately after branching to the programming control program.
These registers must be initialized at the beginning of the programming control program, as the
stack pointer (SP), in particular, is used implicitly in subroutine calls, etc.
7. Boot mode can be cleared by a reset. End the reset after driving the reset pin low, waiting at
least 20 states, and then setting the mode (MD) pins. Boot mode is also cleared when a WDT
overflow occurs.
8. Do not change the MD pin input levels in boot mode.
9. All interrupts are disabled during programming or erasing of the flash memory.
Rev. 7.00 Sep. 11, 2009 Page 464 of 566
REJ09B0211-0700