參數(shù)資料
型號(hào)： PMS430E337AHFD
廠商： Texas Instruments, Inc.
英文描述： MIXED SIGNAL MICROCONTROLLERS
中文描述： 混合信號(hào)微處理器
文件頁(yè)數(shù)： 13/30頁(yè)
文件大?。?/td> 390K
代理商： PMS430E337AHFD
MSP430C33x, MSP430P337A
MIXED SIGNAL MICROCONTROLLERS
SLAS227 – OCTOBER 1999
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Timer/Port
The Timer/Port module has two 8-bit counters, an input that triggers one counter and six digital outputs with
3-state capability. Both counters have an independent clock selector for selecting an external signal or one of
the internal clocks (ACLK or MCLK). One of the counters has an extended control capability to halt, count
continuously, or gate the counter by selecting one of two external signals. This gate signal sets the interrupt flag
if an external signal is selected and the gate stops the counter.
Both timers can be read to and written from by software. The two 8-bit counters can be cascaded to form a 16-bit
counter. A common interrupt vector is implemented. The interrupt flag can be set by three events in the 8-bit
counter mode (gate signal or overflow from the counters) or by two events in the 16-bit counter mode (gate signal
or overflow from the MSB of the cascaded counter).
slope A/D conversion
Slope A/D conversion is accomplished with the Timer/Port module using external resistor(s) for reference (R
ref
),
external resistor(s) to the measured (R
meas
), and an external capacitor. The external components are driven
by software in such a way that the internal counter measures the time that is needed to charge or discharge
the capacitor.The reference resistor’s (R
ref
) charge or discharge time is represented by N
ref
counts. The
unknown resistors (R
meas
) charge or discharge time is represented by N
meas
counts. The unknown resistor’s
value R
meas
is the value of R
ref
multiplied by the relative number of counts (N
meas
/N
ref
). This value determines
resistive sensor values that correspond to the physical data, for example temperature, when an NTC or PTC
resistor is used.
Timer_A
The Timer_A module offers one sixteen bit counter and five capture/compare registers. The timer clock source
can be selected to come from an external source TACLK (SSEL=0), the ACLK (SSEL=1), or MCLK (SSEL=2
or SSEL=3). The clock source can be divided by one, two, four or eight. The timer can be fully controlled (in word
mode) since it can be halted, read, and written. It can be stopped, run continuously, count up, or count up/down
using one compare block to determine the period. The five capture/compare blocks are configured by the
application software to run in either capture or compare mode.
The capture mode is primarily used to measure external or internal events with any combination of positive,
negative, or both edges of the clock. The clock can also be stopped in capture mode by software. One external
event
(CCISx=0) per capture block can be selected. If CCISx=1, the ACLK is the capture signal; and if CCISx=2
or CCISx=3, software capture is chosen.
The compare mode is primarily used to generate timing for the software or application hardware or to generate
pulse-width modulated output signals for various purposes like D/A conversion functions or motor control. An
individual output module, which can run independently of the compare function or is triggered in several ways,
is assigned to each of the five capture/compare registers.
Two interrupt vectors are used by the Timer_A module. One individual vector is assigned to capture/compare
block CCR0 and one common interrupt vector is assigned to the timer and the other four capture/compare
blocks. The five interrupt events using the common vector are identified by an individual interrupt vector word.
The interrupt vector word is used to add an offset to the program counter to continue the interrupt handler
software at the correct location. This simplifies the interrupt handler and gives each interrupt event the same
interrupt handler overhead of 5 cycles.
8-bit Timer/Counter
The 8-bit interval timer supports three major functions for applications:
Serial communication or data exchange
Plus counting or plus accumulation
Timer
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