C868 Datasheet, PDF (18/82 Pages) Infineon Technologies AG – 8-Bit Single-Chip Microcontroller

C868
Start
Yes
Phase A
Bootstrap from
serial
EEPROM
Read serial
EEPROM (first byte)
byte=A5_H?
No
Phase B
Init serial interface 0
and synchronize to
the host baud rate
Receive header
block from host
Phase B, Phase I
Phase B, Phase II
Activate mode 0
Load custom code
to SRAM/XRAM
Select working
mode
Activate Mode 1 Activate Mode 2
Execute custom Execute custom
program in XRAM program in SRAM
Activate Mode 4
Load program from
I2C serial EEPROM
to SRAM/XRAM
Activate Mode 3
Load program from SPI serial
EEPROM to SRAM/XRAM
Figure 7 The phases of the Bootstrap Loader
The serial communication is activated in phase B. Using a full duplex serial cable
(RS232), the MCU must be connected to the serial port of the host computer as shown
in Figure 8.
PC
Host Computer
Serial Interface
(asynchronous, 8N1)
Serial Cable
full duplex, RS232
Figure 8 Bootstrap Loader Interface to the PC
C868
Serial Interface,
UART Mode 1
(asynchronous, 8N1)
Data Sheet
18
V 1.0, 2003-05