sak-c868p-1rr Infineon Technologies Corporation, sak-c868p-1rr Datasheet - Page 246

• Manufacturer Part Number: sak-c868p-1rr
• Description: 8 - Bit Cmos Microcontroller
• Manufacturer: Infineon Technologies Corporation

C868
The Bootstrap Loader
Mode 1, 2, 3 and 4 has the same block structures.
Mode 1 is used to execute program in the XRAM of the MCU at 0FF00H. The MCU
would exit the bootstrap mode and enter the XRAM mode after the communication
process is completed.
Mode 2 is used to execute program in the SRAM of the MCU at 0000H. . The MCU would
exit the bootstrap mode and enter the normal mode after the communication process is
completed.
Mode 3 is used to transfer program from the SPI serial EEPROM to the XRAM or SRAM
of the MCU. Note that if the phase A (bootstrap from serial EEPROM) is invoked after
reset, the MCU would jump to the Jump Address specified by the last transfer block after
the downloading process. However, in mode 3 of phase II of phase B, the MCU will return
to the beginning of Phase II after downloading. Jumping to XRAM/SRAM can be invoked
by other host commands. This is to allow more control by the host.
Mode 4 is used to transfer program from the I2C serial EEPROM to the XRAM or SRAM
of the MCU. Note that if the phase A (bootstrap from serial EEPROM) is invoked after
reset, the MCU would jump to the Jump Address specified by the last transfer block after
the downloading process. However, in mode 4 of phase II of phase B, the MCU will return
to the beginning of Phase II after downloading. Jumping to XRAM/SRAM can be invoked
by other host commands. This is to allow more control by the host.
The block structures are described in
Figure
9-12. In these modes, the header block is
the only transfer block to be sent by the host, no further serial communication is
necessary.
Figure
9-13,
Figure 9-14
shows the communication structure and the
transfer protocol for mode 1.
Figure
9-15,
Figure 9-16
shows the communication
structure and the transfer protocol for mode 2.
Figure
9-17,
Figure 9-18
shows the
communication structure and transfer protocol for mode 3 and 4.
User’s Manual
9-16
V 1.0, 2003-01