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Chapter 4 Timer Functions
[
5-2-3 "Serial Interface
Transfer Timing"]
TM4OCH
Register setting
value
X '00'
X '01'
X '02'
X '04'
X '08'
X '10'
74
16-bit Timer Operation (timer 4)
Setting the Added Pulse Position
The upper 8 bits of compare register 4 (TM4OCH) set the position of the added pulse. If the
TM4OCH register is set to X'00', an additional bit is not appended to the basic PWM
component. If the TM4OCH register is set to X'FF', an additional bit is repeatedly appended
to the 255 basic PWM components during the period. The relation between the value set in
the TM4OCH register and the added pulse is shown in the table below. If X'03' is set in the
TM4OCH register, bits are appended to pulse positions for X'01' and X'02', shown in table
4-3-1. The relation between the value set in the TM4OCH register and the position of the
added bit is shown in figure 4-3-5.
Table 4-3-1 Pulse-Added PWM OutputFigure
Value Set in TM4OCH Register
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1
0 0 0 0 0 0 1 0
0 0 0 0 0 1 0 0
0 0 0 0 1 0 0 0
0 0 0 1 0 0 0 0
0 0 1 0 0 0 0 0
0 1 0 0 0 0 0 0
1 0 0 0 0 0 0 0
(MSB)
0
X '40'
PWM basic component
Position of added pulse X'87'
Figure 4-3-5 Pulse Added Type PWM Output
Added Pulse Position (value of Tn)
X'80'
X'40',X'C0'
X'20',X'60',X'A0',X'E0'
X'10',X'30',X'50',X'70',X'90',X'B0',X'D0',X'F0'
X'08',X'18',X'28',X'38',X'48',X'58' . . . . .,X'E8',X'F8'
X'04',X'0C',X'14',X'1C',X'24',X'2C' . . . . .,X'F4',X'FC'
X'02',X'06',X'0A',X'0E',X'12',X'16' . . . . .,X'FA',X'FE'
X'01',X'03',X'05',X'07',X'09',X'0B' . . . . .,X'FD',X'FF'
(LSB)
Repeated 256 times
X '80'
X 'C0'
Position of added pulse X'88'
X 'FF'
Position of
added pulse
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