ST10F276Z5 datasheet(49/239 Pages) STMICROELECTRONICS

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ST10F276Z5

Bootstrap loader

49/239

Valid dominant bit on CAN1 RxD

The ST10F276Z5 starts bootstrapping via CAN1; the bootstrapping method is new and is

described in the next paragraph 5.4. Figure 5 shows the program flow of the new bootstrap

loader. It clearly illustrates how the new functionalities are implemented:

●

UART: UART has priority over CAN after a falling edge on CAN1_RxD until the first

valid rising edge on CAN1_RxD;

●

CAN: Pulses on CAN1_RxD shorter than 20*CPU-cycles are filtered.

5.2.2

ST10 configuration in BSL

When the ST10F276Z5 has entered BSL mode, the configuration shown in Table 30 is

automatically set (values that deviate from the normal reset values are marked in bold).

Table 30.

ST10 configuration in BSL mode

Function or register

Access

Notes

Watchdog Timer

Disabled

0404H

(1)

In Bootstrap modes (standard or alternate) ROMEN, bit 10 of SYSCON, is always set regardless of EA pin

level. BYTDIS, bit 9 of SYSCON, is set according to data bus width selection via Port0 configuration.

XPEN bit set for Bootstrap via CAN or

Alternate Boot mode

Context Pointer CP

FA00H

FC00H

Stack Pointer SP

FA40H

FA00H

access to startup

configuration(2)

BUSCON0 is initialized with 0000h, external bus disabled, if pin EA is high during reset. If pin EA is low

during reset, BUSACT0, bit 10, and ALECTL0, bit 9, are set enabling the external bus with lengthened ALE

signal. BTYP field, bit 7 and 6, is set according to Port0 configuration.

8011H

Initialized only if Bootstrap via UART

access to ‘00’ byte

Initialized only if Bootstrap via UART

P3.10 / TXD0

‘1’

Initialized only if Bootstrap via UART

DP3.10

‘1’

Initialized only if Bootstrap via UART

CAN1 Status/Control

0000H

Initialized only if Bootstrap via CAN

CAN1 Bit Timing Register

access to ‘0’ frame

Initialized only if Bootstrap via CAN

XPERCON

042DH

XRAM1-2, XFlash, CAN1 and XMISC

enabled. Initialized only if Bootstrap via CAN

P4.6 / CAN1_TxD

‘1’

Initialized only if Bootstrap via CAN

DP4.6

‘1’

Initialized only if Bootstrap via CAN

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