Rev. 1.00, 09/03, page 552 of 704
The system configuration diagram in boot mode is shown in figure 20.6. For details on the pin
setting in boot mode, see table 20.5. The NMI and other interrupts are ignored in boot mode.
However, the NMI and other interrupts should be disabled in the system.
Host
RxD1
TxD1
Control command,
analysis execution
software (on-chip)
Flash
memory
On-chip RAM
On-chip SCI_1
This LSI
Boot
programming
tool and program
data
Control command, program data
Reply response
Figure 20.6 System Configuration in Boot Mode
(1) SCI Interface Setting by Host
When boot mode is initiated, this LSI measures the low period of asynchronous SCI-communica-
tion data (H'00), which is transmitted consecutively by the host. The SCI transmit/receive format
should be set to 8-bit data, 1 stop bit, and no parity. This LSI calculates the bit rate which is
transmitted by the host according to the measured low period and transmits the bit adjustment end
sign (1 byte of H'00) to the host. The host must confirm that this bit adjustment end sign (H'00)
has been received normally and transmit 1 byte of H'55 to this LSI. When reception is not
performed normally, boot mode is initiated again (reset) and the operation described above must
be executed. The bit rates of the host and this LSI do not match according to the bit rate
transmitted by the host and system clock frequency of this LSI. To operate the SCI normally, the
transfer bit rate of the host must be set to 4,800 bps, 9,600 bps, or 19,200 bps.
The system clock frequency, which can automatically adjust the transfer bit rate of the host and
the bit rate of this LSI, is shown in table 20.6. Boot mode must be initiated in the range of this
system clock.
D0
D1
D2
D3
D4
D5
D6
D7
Start
bit
Stop bit
Measure low period (9 bits) (data is H'00)
High period of
at least 1 bit
Figure 20.7 Automatic-Bit-Rate Adjustment Operation of SCI
Содержание H8S/2437
Страница 2: ...Rev 1 00 09 03 page ii of xxxviii ...
Страница 8: ...Rev 1 00 09 03 page viii of xxxviii ...
Страница 32: ...Rev 1 00 09 03 page xxxii of xxxviii ...
Страница 38: ...Rev 1 00 09 03 page xxxviii of xxxviii ...
Страница 168: ...Rev 1 00 09 03 page 130 of 704 ...
Страница 336: ...Rev 1 00 09 03 page 298 of 704 ...
Страница 402: ...Rev 1 00 09 03 page 364 of 704 ...
Страница 454: ...Rev 1 00 09 03 page 416 of 704 ...
Страница 512: ...Rev 1 00 09 03 page 474 of 704 ...
Страница 562: ...Rev 1 00 09 03 page 524 of 704 ...
Страница 648: ...Rev 1 00 09 03 page 610 of 704 ...
Страница 672: ...Rev 1 00 09 03 page 634 of 704 ...
Страница 732: ...Rev 1 00 09 03 page 694 of 704 ...
Страница 742: ...Rev 1 00 09 03 page 704 of 704 ...
Страница 745: ......
Страница 746: ...H8S 2437 Group Hardware Manual REJ09B0059 0100Z ...