Toshiba TX79 Series User Manual page 200

10.5.1.1 Divisors For Counting
Table 10-13 shows the counter frequencies that result from selecting and dividing the
internal 66/50 MHz clock by the decimal Divider values given (using these values in the
Divider Register). These frequencies are used in all three counter modes.
Table 10-13 Divider values and Counter Frequencies Generated
Divider
Decimal CCDR
<CCD>
2 0b000
4 0b001
8 0b010
16 0b011
32 0b100
64 0b101
128 0b110
256 0b111
Divider
Decimal CCDR
<CCD>
2 0b000
4 0b001
8 0b010
16 0b011
32 0b100
64 0b101
128 0b110
256 0b111
TX7901 User's Manual (Rev. 6.30T – Nov, 2001)
Chapter 10: Programmable Timer/Contents
gbusClk =
Freq. Unit Resolution Unit
33.33 MHz
16.67 MHz
8.33 MHz 120 ns
4.17 MHz 240 ns
2.08 MHz 480 ns
1.04 MHz 960 ns
520.83 kHz 1.92 us
260.42 kHz 3.84 us
gbusClk =
Freq. Unit Resolution Unit
25.00 MHz
12.50 MHz
6.25 MHz 160 ns
3.13 MHz 320 ns
1.56 MHz 640 ns
781.25 kHz 1.28 us
390.63 kHz 2.56 us
195.31 kHz 5.12 us
10-17
66.7 MHz
24bit Generate
Max 60Hz
Time(s) interval
30 ns 0.50 555,556 33,333,333
60 ns 1.01 277,778 16,666,667
2.01 138,889
4.03
8.05
16.11
32.21
64.42
50.0 MHz
24bit Generate
Max 60Hz
Time(s) interval
40 ns 0.67 416,667 25,000,000
80 ns 1.34 208,333 12,500,000
2.68 104,167
5.37
10.74
21.47
42.95
85.90
Counter
value for 1
second
8,333,333
69,444 4,166,667
34,722 2,083,333
17,361 1,041,667
8,681 520,833
4,340 260,417
Counter
value for 1
second
6,250,000
52,083 3,125,000
26,042 1,562,500
13,021 781,250
6,510 390,625
3,255 195,313