HD6433682 ETC, HD6433682 Datasheet - Page 124

• Manufacturer Part Number: HD6433682
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
• Manufacturer: ETC

4. After matching the bit rates, the chip transmits one H'00 byte to the host to indicate the
5. In boot mode, a part of the on-chip RAM area is used by the boot program. The area H'F780 to
6. Before branching to the programming control program, the chip terminates transfer operations
7. Boot mode can be cleared by a reset. End the reset after driving the reset pin low, waiting at
8.
Rev. 3.00, 05/03, page 94 of 472
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 7.3.
H'FEEF 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.
by SCI3 (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 program data or verify data with the host. The TxD pin is high (PCR22 = 1, P22 = 1). 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.
least 20 states, and then setting the NMI pin. Boot mode is also cleared when a WDT overflow
occurs.
Do not change the TEST pin and NMI pin input levels in boot mode.