參數(shù)資料
型號(hào): ST72361AR9TC
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝: 10 X 10 MM, ROHS COMPLIANT, PLASTIC, TQFP-64
文件頁(yè)數(shù): 137/224頁(yè)
文件大小: 4821K
代理商: ST72361AR9TC
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ST72361-Auto
221/224
IMPORTANT NOTES (Cont’d)
Occurrence
The occurrence of the problem is random and pro-
portional to the baud rate. With a transmit frequen-
cy
of
19200
baud
(fCPU = 8
MHz
and
SCIBRR = 0xC9), the wrong break duration occur-
rence is around 1%.
Analysis
The LIN protocol specifies a minimum of 13 bits for
the break duration, but there is no maximum value.
Nevertheless, the maximum length of the header
is specified as (14 + 10 + 10 + 1) x 1.4 = 49 bits.
This is composed of:
- the synch break field (14 bits)
- the synch field (10 bits)
- the identifier field (10 bits)
Every LIN frame starts with a break character.
Adding an idle character increases the length of
each header by 10 bits. When the problem occurs,
the header length is increased by 11 bits and be-
comes ((14 + 11) + 10 + 10 + 1) = 45 bits.
To conclude, the problem is not always critical for
LIN communication if the software keeps the time
between the sync field and the ID smaller than 4
bits, that is, 208s at 19200 baud.
The workaround is the same as for SCI mode but
considering the low probability of occurrence (1%),
it may be better to keep the break generation se-
quence as it is.
16.2.2 16-bit and 8-bit Timer PWM Mode
In PWM mode, the first PWM pulse is missed after
writing the value FFFCh in the OC1R or OC2R
register.
16.3 ROM DEVICES ONLY
16.3.1 16-bit Timer PWM Mode Buffering
Feature Change
In all devices, the frequency and period of the
PWM signal are controlled by comparing the coun-
ter with a 16-bit buffer updated by the OCiHR and
OCiLR registers. In ROM devices, contrary to the
output compare function is not inhibited after a
write instruction to the OCiHR register. Instead the
buffer update at the end of the PWM period is in-
hibited until OCiLR is written. This improved buffer
handling is fully compatible with applications writ-
ten for Flash devices.
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