C167CS datasheet(313/517 Pages) INFINEON

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C167CS

Derivatives

The Bootstrap Loader

User’s Manual

15-3

V2.0, 2000-07

Initial State in BSL Mode

After entering BSL mode and the respective initialization1) the C167CS scans the RxD0

line to receive a zero byte, i.e. one start bit, eight ‘0’ data bits and one stop bit. From the

duration of this zero byte it calculates the corresponding baudrate factor with respect to

the current CPU clock, initializes the serial interface ASC0 accordingly and switches pin

TxD0 to output. Using this baudrate, an identification byte is returned to the host that

provides the loaded data.

This identification byte identifies the device to be booted. The following codes are

defined:

55H:

8xC166.

A5H:

Previous versions of the C167 (obsolete).

B5H:

Previous versions of the C165.

C5H:

C167 derivatives.

D5H:

All devices equipped with identification registers.

Note: The identification byte D5H does not directly identify a specific derivative. This

information can in this case be obtained from the identification registers.

When the C167CS has entered BSL mode, the following configuration is automatically

set (values that deviate from the normal reset values, are

marked):

Watchdog Timer:

Disabled

FC00H

Context Pointer CP:

FA00H

F600H

Stack Pointer SP:

FA40H

acc. to startup config.

8011H

P3.10/TXD0:

‘1’

acc. to ‘00’ byte

DP3.10:

‘1’

Other than after a normal reset the watchdog timer is disabled, so the bootstrap loading

sequence is not time limited. Pin TxD0 is configured as output, so the C167CS can return

the identification byte.

Note: Even if the internal ROM/OTP/Flash is enabled, no code can be executed out of

it while the C167CS is in BSL mode.

1) The external host should not send the zero byte before the end of the BSL initialization time (see Figure 15-1)

to make sure that it is correctly received.

C167CS Datasheet(PDF) 313 Page - Infineon Technologies AG

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