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参数资料
型号： ST72C314N4TC
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封装： 14 X 14 MM, ROHS COMPLIANT, TQFP-64
文件页数： 143/150页
文件大小： 3530K
代理商： ST72C314N4TC
ST72334xx-Auto, ST72314xx-Auto, ST72124Jx-Auto
92/150
SERIAL COMMUNICATIONS INTERFACE (Cont’d)
13.5.5.4 Conventional Baud Rate Generation
The baud rate for the receiver and transmitter (Rx
and Tx) are set independently and calculated as
follows:
with:
PR = 1, 3, 4 or 13 (see SCP0 and SCP1 bits)
TR = 1, 2, 4, 8, 16, 32, 64,128
(see SCT0, SCT1 and SCT2 bits)
RR = 1, 2, 4, 8, 16, 32, 64,128
(see SCR0,SCR1 and SCR2 bits)
All this bits are in the BRR register.
Example: If fCPU is 8 MHz (normal mode) and if
PR = 13 and TR = RR = 1, the transmit and re-
ceive baud rates are 19200 baud.
Caution: The baud rate register (SCIBRR) MUST
NOT be written to (changed or refreshed) while the
transmitter or the receiver is enabled.
13.5.5.5 Extended Baud Rate Generation
The extended prescaler option gives a very fine
tuning on the baud rate, using a 255 value prescal-
er, whereas the conventional Baud Rate Genera-
tor retains industry standard software compatibili-
ty.
The extended baud rate generator block diagram
is described in the Figure 49.
The output clock rate sent to the transmitter or to
the receiver will be the output from the 16 divider
divided by a factor ranging from 1 to 255 set in the
ERPR or the ETPR register.
Note: the extended prescaler is activated by set-
ting the ETPR or ERPR register to a value other
than zero. The baud rates are calculated as fol-
lows:
with:
ETPR = 1,..,255 (see ETPR register)
ERPR = 1,.. 255 (see ERPR register)
13.5.5.6 Receiver Muting and Wake-up Feature
In multiprocessor configurations it is often desira-
ble that only the intended message recipient
should actively receive the full message contents,
thus reducing redundant SCI service overhead for
all non addressed receivers.
The non addressed devices may be placed in
sleep mode by means of the muting function.
Setting the RWU bit by software puts the SCI in
sleep mode:
All the reception status bits can not be set.
All the receive interrupt are inhibited.
A muted receiver may be awakened by one of the
following two ways:
– by Idle Line detection if the WAKE bit is reset,
– by Address Mark detection if the WAKE bit is set.
Receiver wakes-up by Idle Line detection when
the Receive line has recognized an Idle Frame.
Then the RWU bit is reset by hardware but the
IDLE bit is not set.
Receiver wakes-up by Address Mark detection
when it received a “1” as the most significant bit of
a word, thus indicating that the message is an ad-
dress. The reception of this particular word wakes
up the receiver, resets the RWU bit and sets the
RDRF bit, which allows the receiver to receive this
word normally and to use it as an address word.
Tx =
(32*PR)*TR
fCPU
Rx =
(32*PR)*RR
fCPU
Tx =
16*ETPR
fCPU
Rx =
16*ERPR
fCPU
相关PDF资料
PDF描述
ST72124J2TC/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
ST72334J4TB/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP44
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ST72314N4TB/XXX 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP64
相关代理商/技术参数
参数描述
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ST72C334J4T6/TR 制造商:STMicroelectronics 功能描述:
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