參數(shù)資料
型號(hào): ST72521B
英文描述: ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE
中文描述: ST72521B - 80/64-PIN 8位32至60,000 ROM的微處理器。 5個(gè)定時(shí)器。的SPI。脊髓損傷。 I2C總線。 CAN接口
文件頁數(shù): 142/198頁
文件大?。?/td> 2504K
代理商: ST72521B
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ST72521B
142/198
CONTROLLER AREA NETWORK
(Cont’d)
9.8.5 List of CAN Cell Limitations
9.8.5.1 Omitted SOF bit
Symptom:
Start of Frame (SOF) bit is omitted if transmission
is requested in the last Intermission bit.
Test Case:
5.3.1 10-Kbit Stress Test
Details:
The IUT is requested to start transmission immedi-
ately after the completion of the previous transmis-
sion. The LT also starts its transmission and as-
serts the SOF bit just after the 3
rd
Intermission bit.
The IUT also starts transmission but omits the
SOF bit. The IUT wins the arbitration and contin-
ues the transmission. The frame is sent correctly.
Impact On The Application:
As this effect only occurs when the IUT detects a
SOF bit on the CAN bus, the fact that it omits its
own SOF bit has no impact on the communication.
9.8.5.2 CAN: CPU Write Access (More Than
One Cycle) Corrupts CAN Frame
Symptoms:
For CAN received messages the identifier high
byte or last data byte can be corrupted.
For CAN transmitted messages the 2nd data byte
can be corrupted.
Details:
The CAN transmit and receive buffers are imple-
mented as dual ported RAM. During the reception
of a CAN frame the CAN core writes the received
identifier and the data byte-by-byte in the corre-
sponding buffer.
IF
the CAN bit timing configuration is t
BS2
< 5 time
quanta
AND
IF
concurrently with the pCAN, the CPU executes
a write access to the dual ported RAM using an in-
struction with more than one cycle access, e.g.
CLR, BSET, BRES
THEN
the access conflict can lead to the corrup-
tion described in the symptoms paragraph above.
Impact On The Application:
Several CAN frames with erroneous data or iden-
tifier will be received/transmitted.
Software Workaround:
Program t
BS2
> 4 time quanta or, when accessing
the receive or transmit buffers, do not use the crit-
ical instructions which are:
BSET, BRES, CLR, CPL, DEC, INC, NEG, RLC,
SLL, SRL, RRC, SRA, SWAP.
9.8.5.3 WKPS Functionality
Due a fix implemented to solve the “Unexpected
Message
Transmission”
ST72F521 devices, the WKPS functionality has
been modified as follows in ROM and Flash
ST72521 and ROM ST72521B devices:
issue
present
in
Device
Modification
ST72F521
Rev R
WKPS bit does not generate a wakeup
pulse. It is used to synchronize the re-
set of the LOCK bit
WKPS bit functions according to the
datasheet description.
WKPS bit does not generate a wakeup
pulse. Resetting the LOCK bit works
correctly, but for code compatibility
with the flash device, the WKPS func-
tionality has been removed.
ST72521 All
revisions
ST72521B
Rev Z
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ST72521BAR6 ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE
ST72521BAR9 ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE
ST72521BM6 ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE
ST72521BM9 ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE
ST72521BR6 ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE
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