參數(shù)資料
型號(hào)： ST90135M6LVT6
英文描述： 8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 %2B FAMILY
中文描述： 8/16至64K ROM的16位微控制器（MCU）。 OTP或EPROM。 512到2K的RAM - ST9%2B系列
文件頁(yè)數(shù)： 131/199頁(yè)
文件大?。?/td> 2813K
代理商： ST90135M6LVT6
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ST90158 - STANDARD TIMER (STIM)
STANDARD TIMER
(Cont’d)
9.4.2 Functional Description
9.4.2.1 Timer/Counter control
Start-stop Count.
The ST-SP bit (STC.7) is used
in order to start and stop counting. An instruction
which sets this bit will cause the Standard Timer to
start counting at the beginning of the next instruc-
tion. Resetting this bit will stop the counter.
If the counter is stopped and restarted, counting
will resume from the value held at the stop condi-
tion, unless a new constant has been entered in
the Standard Timer registers during the stop peri-
od. In this case, the new constant will be loaded as
soon as counting is restarted.
A new constant can be written in STH, STL, STP
registers while the counter is running. The new
value of the STH and STL registers will be loaded
at the next End of Count condition, while the new
value of the STP register will be loaded immedi-
ately.
WARNING:
In order to prevent incorrect counting of
the Standard Timer, the prescaler (STP) and counter
(STL, STH) registers must be initialised before the
starting of the timer. If this is not done, counting will
start with the reset values (STH=FFh, STL=FFh,
STP=FFh).
Single/Continuous Mode.
The S-C bit (STC.6) selects between the Single or
Continuous mode.
SINGLE MODE: at the End of Count, the Standard
Timer stops, reloads the constant and resets the
Start/Stop bit (the user programmer can inspect
the timer current status by reading this bit). Setting
the Start/Stop bit will restart the counter.
CONTINUOUS MODE: At the End of the Count, the
counter automatically reloads the constant and re-
starts. t s only stopped by resetting he Start/Stop bit.
The S-C bit can be written either with the timer
stopped or running. It is possible to toggle the S-C
bit and start the Standard Timer with the same in-
struction.
9.4.2.2 Standard Timer Input Modes (ST9
devices with Standard Timer Input STIN)
Bits INMD2, INMD1 and INEN are used to select
the input modes. The Input Enable (INEN) bit ena-
bles the input mode selected by the INMD2 and
INMD1 bits. If the input is disabled (INEN="0"), the
values of INMD2 and INMD1 are not taken into ac-
count. In this case, this unit acts as a 16-bit timer
(plus prescaler) directly driven by INTCLK/4 and
transitions on the input pin have no effect.
Event Counter Mode
(INMD1 = "0", INMD2 = "0")
The Standard Timer is driven by the signal applied
to the input pin (STIN) which acts as an external
clock. The unit works therefore as an event coun-
ter. The event is a high to low transition on STIN.
Spacing between trailing edges should be at least
the period of INTCLK multiplied by 8 (i.e. the max-
imum Standard Timer input frequency is 3 MHz
with INTCLK = 24MHz).
Gated Input Mode
(INMD1 = "0", INMD2 = “1”)
The Timer uses the internal clock (INTCLK divided
by 4) and starts and stops the Timer according to
the state of STIN pin. When the status of the STIN
is High the Standard Timer count operation pro-
ceeds, and when Low, counting is stopped.
Triggerable Input Mode
(INMD1 = “1”, INMD2 = “0”)
The Standard Timer is started by:
a) setting the Start-Stop bit, AND
b) a High to Low (low trigger) transition on STIN.
In order to stop the Standard Timer in this mode, it
is only necessary to reset the Start-Stop bit.
Retriggerable Input Mode
(INMD1 = “1”, INMD2
= “1”)
In this mode, when the Standard Timer is running
(with internal clock), a High to Low transition on
STIN causes the counting to start from the last
constant loaded into the STL/STH and STP regis-
ters. When the Standard Timer is stopped (ST-SP
bit equal to zero), a High to Low transition on STIN
has no effect.
9.4.2.3 Time Base Generator (ST9 devices
without Standard Timer Input STIN)
For devices where STIN is replaced by a connec-
tion to CLOCK2, the condition (INMD1 = “0”,
INMD2 = “0”) will allow the Standard Timer to gen-
erate a stable time base independent from the PLL
programming.
9
相關(guān)PDF資料
PDF描述
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ST90158M9 8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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ST90135M6T6 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM
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