Program Example Of Counter Function - Fujitsu F2MC-8L F202RA Hardware Manual

CHAPTER 8 8/16-BIT CAPTURE TIMER/COUNTER
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Program Example of Counter Function

● Processing specifications
• In the 16-bit mode, timer 0 and timer 1 are used to generate an interrupt whenever the external clock to
be input to the EC pin is counted 5,000 times (1388
• The sample program for reading the 16-bit counter value when the counter is in operation is shown
below (READ16).
● Coding example
DDR3
TCCR
TCR1
TCR0
TDR1
TDR0
TIF0
ILR1
INT_V
IRQD
;------------------------Main program---------------------------------------------------------------------------------
;------------------------Data read subroutine-------------------------------------------------------------------------
READ16
202
EQU 000DH
EQU 0019H
EQU 001AH
EQU 001BH
EQU 001CH
EQU 001DH
EQU TCR0:7
EQU 007CH
DSEG ABS
ORG 0FFF0H
DW WARI
ENDS
CSEG
:
MOV DDR3,#00000000B ; Sets the EC pin to input.
CLRI
MOV ILR1,#10111111B
MOV TDR0,#088H
MOV TDR1,#013H
MOV TCR1,#00001110B ; Sets timer 1 to 16-bit mode.
MOV TCR0,#01101111B ; Clears the timer 0 interrupt request flag, allows interrupt
SETI
MOVW A,TDR1
MOVW A,TDR1
CMPW A
BEQ RET16
).
H
; Address of port 3-direction register
; Address of capture control register
; Address of timer 1 control register
; Address of timer 0 control register
; Address of timer 1 data register
; Address of timer 0 data register
; Defines the timer 0 interrupt request flag bit.
; Address of interrupt level setting register 2
; [DATA SEGMENT]
; Sets the interrupt vector.
; [CODE SEGMENT]
; The stack pointer (SP), etc., is already initialized.
; Disables the interrupt.
; Sets the interrupt level to 2.
; Sets the counter value and the lower 8 bits of the
compare value.
; Sets the counter value and the higher 8 bits of the
compare value.
request output, selects an external clock, clears the
counter, starts the operation, and increments the counter
at a rising edge.
; Enables a CPU interrupt.
; Reads 16 bits from TDR1 and TDR0.
; Reads 16 bits from TDR1 and TDR0 and stores the old
value in the T register.
; Executes double read check and compares A with T.
; Match and return