參數(shù)資料
型號(hào)： M30102M3-XXXFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP48
封裝： 7 X 7 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件頁數(shù)： 135/166頁
文件大?。?/td> 2060K
代理商： M30102M3-XXXFP
Under
development
Tentative Specifications REV.E1
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30100/M30102 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer X
67
Table 1.14.6. Specifications of pulse width measurement mode
(4) Pulse width measurement mode
In this mode, the timer measures the pulse width of an external signal fed to CNTR0 pin. (See Table
1.14.6) Figure 1.14.9 shows the Timer X mode register in pulse width measurement mode. Figure
1.14.10 shows an operation example in pulse width measurement mode.
Item
Specification
Count source
f1, f8, f32, fC32
Count operation
Down count
Continuously counts the selected signal only when the measurement pulse is "H" level,
or conversely only "L" level.
When the timer underflows, it reloads the reload register contents before continuing
counting
Count start condition
Count start flag is set (=1)
Count stop condition
Count start flag is reset (=0)
Interrupt request generation timing When Timer X underflows [Timer X interruption]
Rising (R0EDG=0) or falling (R0EDG=1) of CNTR0 input [CNTR0 interruption]
CNTR0 pin function
Measurement pulse input
TXOUT pin function
Programmable I/O port
Read from timer
Count value can be read out by reading Timer X register.
Same applies to Prescaler X register.
Write to timer
When a value is written to Timer X register, it is written to both reload register and counter.
Same applies to Prescaler X register.
Select function
CNTR0 polarity switching function
The measurement pulse input can be selected to be "H" level width or "L" level width by
software.
Timer X mode register
Symbol
Address
When reset
TXMR
008B16
000000002
Bit name
Function
Bit symbol
W
R
b7
b6 b5
b4
b3
b2
b1 b0
1 1 : Pulse width measurement mode
b1 b0
TXMOD2
TXS
TXMOD1
R0EDG
TXMOD0
CNTR0 polarity
switching bit
Operation mode
select bit 0, 1
0 : Measures “H” level width (Interrupt at rising edge)
1 : Measures “L” level width (Interrupt at falling edge)
Timer X count
start flag
0 : Stops counting
1 : Starts counting
0 : Set to "0" in pulse width measurement mode
TXOCNT
0
1
0 : Set to "0" in pulse width measurement mode
0
Note 1: This bit should rewrite with inhibiting the CNTR0 interrupt.
(Note 1)
Invalid in pulse width measurement mode.
When write, set "0". When read, this contents is indeteminate.
TXEDG
TXUND
Invalid in pulse width measurement mode.
When write, set "0". When read, this contents is indeteminate.
Figure 1.14.9. Timer X mode register in pulse width measurement mode
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