Table 13-3 describes TERn elds. 13.4 Code Example The following code provides an example of how to init" />
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉锛� MCF5407AI162
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绋嬪簭瀛樺劜鍣ㄩ鍨嬶細 ROMless
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鍖呰锛� 鎵樼洡
閰嶇敤锛� M5407C3-ND - KIT EVAL FOR MCF5407 W/ETHERNET
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13-6
MCF5407 User鈥檚 Manual
Code Example
Table 13-3 describes TERn elds.
13.4 Code Example
The following code provides an example of how to initialize timer 0 and how to use the
timer for counting time-out periods.
MBARx EQU 0x10000 ;Defines the module base address at 0x10000
TMR0 EQU MBARx+0x140;Timer 0 register
TMR1 EQU MBARx+0x180 ;Timer 1 register
TRR0 EQU MBARx+0x144 ;Timer 0 reference register
TRR1 EQU MBARx+0x184 ;Timer 1 reference register
TCR0 EQU MBARx+0x148 ;Timer 0 capture register
TCR1 EQU MBARx+0x188 ;Timer 1 capture register
TCN0 EQU MBARx+0x14C ;Timer 0 counter
TCN1 EQU MBARx+0x18C ;Timer 1 counter
TER0 EQU MBARx+0x151 ;Timer 0 event register
TER1 EQU MBARx+0x191 ;Timer 1 event register
* TMR0 is defined as: *
*[PS]= 0xFF, divide clock by 256
*[CE] = 00disable interrupt
*[OM] = 0 output=active-low pulse
*[ORI] = 0, disable ref.interrupt
*[FRR] = 1, restart mode enabled
*[CLK] = 10, CLKIN/16
*[RST] = 0, timer 0 disabled
move.w #0xFF0C,D0
move.w D0,TMR0
move.w #0x0000,D0;writing to the timer counter with any
move.w DO,TCN0 ;value resets it to zero
move.w #AFAF,DO ;set the timer 0 reference to be
move.w #D0,TRR0 ;defined as 0xAFAF
The simple example below uses 0 to count time-out loops. A time-out occurs when the
reference value, 0xAFAF, is reached.
timer0_ex
clr.l DO
clr.l D1
clt.l D2
move.w #0x0000,D0
move,w D0,TCN0;reset the counter to 0x0000
move.b #0x03,D0 ;writing ones to TER0[REF,CAP]
move.b D0,TER0 ;clears the event flags
Table 13-3. TERn Field Descriptions
Bits
Name
Description
7鈥�2
鈥�
Reserved
1
REF
Output reference event. The counter has reached the TRR
n value. Setting TMRn[ORI] enables the
interrupt request caused by this event. Writing a one to REF clears the event condition.
0
CAP
Capture event. The counter value has been latched into TCR
n. Setting TMRn[CE] enables the
interrupt request caused by this event. Writing a 1 to CAP clears the event condition.
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