Toshiba H1 SERIES TLCS-900 User Manual
Page 118
TMP92CM22
2007-02-16
92CM22-116
Example: To generate 1/4 duty 62.5 kHz pulses (at f
C
= 40 MHz):
Calculate the value that should be set in the timer register.
To obtain a frequency of 62.5 kHz, the pulse cycle t should be: t = 1/62.5 kHz = 16
μs
φT1 (= (16/fc)s (at f
C
= 40MHz);
16
μs/(16/fc)s = 40
Therefore set TA1REG to 40 (28H)
The duty is to be set to 1/4: t
× 1/4 = 16 μs × 1/4 = 4 μs
4
μs/(16/fc)s = 10
Therefore, set TA0REG
= 10 = 0AH
7
6
5
4
3
2
1
0
TA01RUN
← 0 X X X − 0
0
0
Stop TMRA0 and TMRA1 and clear it to “0”.
TA01MOD
← 1 0 X X X X 0
1
Set the 8-bit PPG mode, and select
φT1 as input clock.
TA0REG
← 0
0
0
0
1
0
1
0
Write 0AH.
TA1REG
← 0
0
1
0
1
0
0
0
Write 28H.
TA1FFCR
← X X X X 0
1
1
X
Set TA1FF and set inversion to enable.
Writing “10” provides negative logic pulse.
PCCR
← X
− −
X
−
X
1
−
PCFC
← X
− −
X
−
X
1
−
Set PC1 to TA1OUT pin.
TA01RUN
← 1 X X X
−
1
1
1
Start TMRA0 and TMRA1 counting.
X
: Don’t care, − : No change
16
μs