Fujitsu MB90480 Series Hardware Manual page 277

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Program example of input capture
Example of setting procedure
Rising edge of the pulse input to IN0 is detected, and
the value of the free-running timer is recorded. Repeat
this twice and measure the time between triggers.
However reading of capture value and calculation
processing is interrupt processing.
<Initial setting>
•
Control free-running timer
Set control register
Clock selection>>
Interrupt request flag>>
Interrupt request enable>>
Count operation>>
Initialization condition of timer>>
TCDT clear>>
Count clock>>
Set timer data value
•
Port
Set IN0 input of port
•
Control input capture
Set control register
Interrupt request flag>>
Interrupt request enable>>
Select ch.1 valid edge polarity>>
Select ch.0 valid edge polarity>>
•
Interrupt related
Set interrupt level
Set I flag
•
Set variable
<Start>
•
Start input capture ch.0
Interrupt control
•
Start Free-running timer
Start count operation
<Interrupt>
•
Interrupt processing
Clear interrupt request flag
(Arbitrary processing)
••••••••••
<Interrupt vector>
•
Set vector table
Note:
Setting related to clock and setting of _set_il (numeric
value) are required in advance. See the chapter of
clock and interrupt.
Program example
void INPUT0_sample(void)
{
freerun_initial();
INPUT0_initial();
INPUT0_start();
freerun_start();
}
void freerun_initial(void)
{
IO_TCCS.word = 0x20; /* Setting value=0000_0000_0010_0000 */
TCCS
.ECKE
.IVF
.IVFE
.STOP
.MODE
.SCLR
.CLK2-0
IO_TCDT = 0x0000;
TCDT
}
void INPUT0_initial(void)
{
IO_DDR9.byte = 0x00; /* DDR9 IN0(P96) input */
Register name. bit name
DDR9 .P96
IO_ICS01.byte = 0x01; /* Setting value=0000_0001 */
ICS01
.ICP1,ICP0
.ICE1,ICE0
.EG11,EG10
.EG01,EG00
IO_ICR07.byte = 0x10; /* Set input capture ch.0 interrupt level
ICR07
__EI();
(CCR)
count = 0;
}
void INPUT0_start(void)
{
Register name. bit name
IO_ICS01.bit.ICE0 = 1;
ICS01 .ICE0
}
void freerun_start(void)
{
Register name. bit name
IO_TCCS.bit.STOP = 0; /* bit5 = 0
TCCS .STOP
}
__interrupt void INPUT0_int(void)
{
Register name. bit name
IO_ICS01.bit.ICP0 = 0;
ICS01 .ICP0
if(count==0)
Data1 = IO_IPCP0;
else if(count==1) {
Data2 = IO_IPCP0;
cycle = (data2-data1)*125; /* Measure time */
}
count++;
}
#pragma intvect INPUT0_int 26
Note:
For the description form of the register, see "SAMPLE I/O REGISTER FILES FOR
2
F MC-16LX FAMILY MB90480 SERIES".
CHAPTER 12 16-BIT INPUT/OUTPUT TIMER
/* bit15 = 0 ECKE internal clock source */
/* bit7 = 0 IVF interrupt request flag */
/* bit6 = 0 IVFE disable interrupt */
/* bit5 = 1 Disable STOP count */
/* bit4 = 0 Initialize by MODE reset, clear bit */
/* bit3 = 0 Initialize SCLR free-running timer value */
/* bit2-0 = 000 CLK2-0 count clock φ*/
/* Initialize timer data value */
/* bit7-6 = 00 Clear ICP1, 0 valid edge flag */
/* bit5-4 = 00 Disable ICE1, 0 interrupt */
/* bit3-2 = 00 No EG11, EG10 ch.1 edge detection */
/* bit1-0 = 01 EG01, EG00 ch.0 rising edge detection */
(arbitrary value) */
/* Enable interrupt */
/* bit4 = 1 Enable ICE0 ch.0 interrupt */
Enable STOP count */
/* bit6 = 0 Clear ICP0 valid edge detection flag */
/* Record value of free-running timer (first time) */
/* Record value of free-running timer (second time) */
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