Tmp92cz26a, 50 mhz) – Toshiba H1 Series User Manual
Page 293
TMP92CZ26A
92CZ26A-290
Example: To generate 1/4 duty 31.25 kHz pulses (at f
C
= 50 MHz)
* Clock state
Clcok gear :
1/1
Prescaler of clock gear : 1/2
Calculate the value which should be set in the timer register.
To obtain a frequency of 31.25 kHz, the pulse cycle t should be: t
= 1/31.25kHz = 32 μs
φT1 = 0.16 μs (at 50 MHz);
32
μs ÷ 0.16 μs = 200
Therefore set TA1REG to 200 (C8H)
The duty is to be set to 1/4: t
× 1/4 = 32 μs × 1/4 = 8 μs
8
μs ÷ 0.16 μs = 50
Therefore, set TA0REG
= 50 = 32H.
7
6
5
4
3
2
1
0
TA01RUN
← − X X X −
−
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 32H.
TA1REG
← 1
1
0
0
1
0
0
0
Write C8H.
TA1FFCR
← X X X X 0
1
1
X
Set TA1FF, enabling both inversion and the double buffer.
Writing 10 provides negative logic pulse.
PM
← − X X X X −
0
X
PMFC
← − X X X X −
1
X
Set PM1 as the TA1OUT pin.
TA01RUN
← 1 X X X −
1
1
1
Start TMRA0 and TMRA1 counting.
X: Don't care,
−: No change
32
μs