h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 306

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 9 8-Bit PWM Timers [H8S/2138 Group]
The lower 4 bits of PWDR specify the position of pulses added to the 16 basic pulses, as shown in
table 9.5. An additional pulse consists of a high period (when OS = 0) with a width equal to the
resolution, added before the rising edge of a basic pulse. When the upper 4 bits of PWDR are
0000, there is no rising edge of the basic pulse, but the timing for adding pulses is the same.
Table 9.5
Rev. 4.00 Jun 06, 2006 page 252 of 1004
REJ09B0301-0400
Lower 4 Bits
Figure 9.2 Example of Additional Pulse Timing (When Upper 4 Bits of PWDR = 1000)
No additional pulse
Additional pulse provided
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Position of Pulses Added to Basic Pulses
0
Yes
Yes
Yes
Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
1
2
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
3
4
Resolution width
Additional pulse
Yes
Yes
Yes
Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
5
6
Basic Pulse No.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
7
8
Yes
Yes
Yes
Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes
Yes Yes Yes Yes Yes Yes Yes
9
10
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
11
12
Yes
Yes
Yes
Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
13
14
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
15