
256
CK
N – 1
N
N + 1
Internal clock
TCNT input
clock
TCNT value
Figure 10.17 Count Timing for Internal Clock Sources
CK
N – 1
N
N + 1
External clock
input pin
TCNT input
clock
TCNT
Figure 10.18 Count Timing for External Clock Sources (Both-Edge Detection)
Compare-Match Waveform Output Function: For ITU channels 0, 1, 3, and 4, the output from
the corresponding TIOCA and TIOCB pins upon compare matches A and B can be in three
modes: 0-level output, 1-level output, or toggle. Toggle output cannot be selected for channel 2.
•
Procedure for selecting the waveform output mode (figure 10.19):
1. Set TIOR to select 0 output, 1 output, or toggle output for compare match output. The
compare match output pin will output 0 until the first compare match occurs.
2. Set a value in GRA or GRB to select the compare match timing.
3. Set the STR bit in TSTR to 1 to start counting.
Содержание HD6417032
Страница 21: ......
Страница 35: ...xiv ...
Страница 85: ...50 ...
Страница 101: ...66 ...
Страница 129: ...94 ...
Страница 135: ...100 ...
Страница 343: ...308 ...
Страница 369: ...334 ...
Страница 383: ...348 ...
Страница 475: ...440 ...
Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
Страница 578: ...543 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 62 Self Refresh ...
Страница 689: ...654 ...