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Rev. 1.00, 05/04, page 154 of 544
The lower four bits of PWDR specify the position of pulses added to the 16 basic pulses. An
additional pulse adds a high period (when OS = 0) with a width equal to the resolution before the
rising edge of a basic pulse. When the upper four bits of PWDR are B'0000, there is no rising edge
of the basic pulse, but the timing for adding pulses is the same. Table 8.5 shows the positions of
the additional pulses added to the basic pulses, and figure 8.2 shows an example of additional
pulse timing.
Table 8.5 Position of Pulses Added to Basic Pulses
Basic Pulse No.
Lower 4 Bits 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
B'0000
B'0001 Yes
B'0010 Yes Yes
B'0011 Yes Yes Yes
B'0100 Yes Yes Yes Yes
B'0101 Yes Yes Yes Yes Yes
B'0110 Yes Yes Yes Yes Yes Yes
B'0111 Yes Yes Yes Yes Yes Yes Yes
B'1000 Yes Yes Yes Yes Yes Yes Yes Yes
B'1001 Yes Yes Yes Yes Yes Yes Yes Yes Yes
B'1010 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
B'1011 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
B'1100 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
B'1101 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
B'1110 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
B'1111 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
No additional pulse
With additional pulse
Resolution width
Additioal pulse
Figure 8.2 Example of Additional Pulse Timing (When Upper 4 Bits of PWDR = B'1000)