參數(shù)資料
型號(hào)： ST90R158T6
英文描述： 8/16-BIT MICROCONTROLLER (MCU) WITH 16 TO 64K ROM. OTP OR EPROM. 512 TO 2K RAM - ST9 + FAMILY
中文描述： 16位產(chǎn)品微控制器（MCU），并配備16至64K的光盤。檢察官辦公室或EPROM。 512 2K的內(nèi)存- ST9家庭
文件頁(yè)數(shù)： 108/199頁(yè)
文件大?。?/td> 2813K
代理商： ST90R158T6
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ST90158 - MULTIFUNCTION TIMER (MFT)
MULTIFUNCTION TIMER
(Cont’d)
9.3.2 Functional Description
The MFT operating modes are selected by pro-
gramming the Timer Control Register (TCR) and
the Timer Mode Register (TMR).
9.3.2.1 Trigger Events
A trigger event may be generated by software (by
setting either the CP0 or the CP1 bits in the
T_FLAGR register) or by an external source which
may be programmed to respond to the rising edge,
the falling edge or both by programming bits A0-
A1 and B0-B1 in the T_ICR register. This trigger
event can be used to perform a capture or a load,
depending on the Timer mode (configured using
the bits in
Table 24
).
An event on the TxINA input or setting the CP0 bit
triggers a capture to, or a load from the REG0R
register (except in Bicapture mode, see Section
9.3.2.11).
An event on the TxINB input or setting the CP1 bit
triggers a capture to, or a load from the REG1R
register.
In addition, in the special case of "Load from
REG0R and monitor on REG1R", it is possible to
use the TxINB input as a trigger for REG0R."
9.3.2.2 One Shot Mode
When the counter generates an overflow (in up-
count mode), or an underflow (in down-count
mode), that is to say when an End Of Count condi-
tion is reached, the counter stops and no counter
reload occurs. The counter may only be restarted
by an external trigger on TxINA or B or a by soft-
ware trigger on CP0 only. One Shot Mode is en-
tered by setting the CO bit in TMR.
9.3.2.3 Continuous Mode
Whenever the counter reaches an End Of Count
condition, the counting sequence is automatically
restarted and the counter is reloaded from REG0R
(or from REG1R, when selected in Biload Mode).
Continuous Mode is entered by resetting the C0 bit
in TMR.
9.3.2.4 Triggered And Retriggered Modes
A triggered event may be generated by software
(by setting either the CP0 or the CP1 bit in the
T_FLAGR register), or by an external source
which may be programmed to respond to the rising
edge, the falling edge or both, by programming
bits A0-A1 and B0-B1 in T_ICR.
In One Shot and Triggered Mode, every trigger
event arriving before an End Of Count, is masked.
In One Shot and Retriggered Mode, every trigger
received while the counter is running, automatical-
ly reloads the counter from REG0R. Triggered/Re-
triggered Mode is set by the REN bit in TMR.
The TxINA input refers to REG0R and the TxINB
input refers to REG1R.
WARNING
. If the Triggered Mode is selected
when the counter is in Continuous Mode, every
trigger is disabled, it is not therefore possible to
synchronise the counting cycle by hardware or
software.
9.3.2.5 Gated Mode
In this mode, counting takes place only when the
external gate input is at a logic low level. The se-
lection of TxINA or TxINB as the gate input is
made by programming the IN0-IN3 bits in T_ICR.
9.3.2.6 Capture Mode
The REG0R and REG1R registers may be inde-
pendently set in Capture Mode by setting RM0 or
RM1 in TMR, so that a capture of the current count
value can be performed either on REG0R or on
REG1R, initiated by software (by setting CP0 or
CP1 in the T_FLAGR register) or by an event on
the external input pins.
WARNING
. Care should be taken when two soft-
ware captures are to be performed on the same
register. In this case, at least one instruction must
be present between the first CP0/CP1 bit set and
the subsequent CP0/CP1 bit reset instructions.
9.3.2.7 Up/Down Mode
The counter can count up or down depending on
the state of the UDC bit (Up/Down Count) in TCR,
or on the configuration of the external input pins,
which have priority over UDC (see Input pin as-
signment in T_ICR). The UDCS bit returns the
counter up/down current status (see also the Up/
Down Autodiscrimination mode in the Input Pin
Assignment Section).
9
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