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MSM66591/ML66592 User's Manual
Chapter 13 PWM Functions
13.2 Operation of PWM
PWM0–PWM11 control duty within a specific cycle (determined by the count clock of
PWC0–PWC11 or by the contents of PWC0–PWC11 and PWC0BF–PWC11BF).
PWM is started by setting the corresponding RUN bit to "1". If the RUN bit becomes "1",
the output F/F is set to "1" at the same time, and "H" level is output to the PWM output
pin (in the case of high active status.) If the contents of the corresponding PWC0–
PWC11 and PWR0–PWR11 match, the output F/F is set to "0", "L" level is output to the
PWM output pin and an individual interrupt request flag is set to "1". If PWC0–PWC11
generate an underflow, the output F/F is set to "1", "H" level is output to the PWM
output pin, an individual interrupt request flag is set to "1", and, at the same time, the
contents of PWC0BF–PWC11BF and PW0BF–PW11BF are loaded to PWC0–PWC11
and PWR0–PWR11, respectively. This operation is repeated, and the duty-controlled
waveform is output from the PWM output pin until the RUN bit is set to "0".
If an underflow of PWC0–PWC11 and a match of the contents of PWC0–PWC11 and
PWR0–PWR11 occur concurrently (when PWR = 0000H is set), the interrupt request by
an underflow of PWC0–PWC11 is given priority. Therefore, only the individual interrupt
request flag by the underflow of PWC0–PWC11 is set to "1"; the individual interrupt
request flag by the match of the contents of PWC0–PWC11 and PWR0–PWR11 is not
set to "1".
The duty immediately after PWM start may become shorter (only 1 cycle), depending
on the selected count clock of PWC0–PWC11. Refer to the following example.
Maximum Errors
TBCCLK
–(TBCCLK – 1 CLK)
1/2 TBCCLK
–(1/2 TBCCLK – 1 CLK)
1/4 TBCCLK
1/8 TBCCLK
0
–(1/4 TBCCLK – 1 CLK)
–(1/8 TBCCLK – 1 CLK)
Master Clock (CLK)
Count Clock
1/16 TBCCLK
–(1/16 TBCCLK – 1 CLK)
1/32 TBCCLK
–(1/32 TBCCLK – 1 CLK)
If a different clock is used for the PWC clock with the equal value set for PWCn and
PWCnBF (n = 0–11) and PWnRUN bit is set to "1" at the same time, the cycle will be
equal, however a synchronization shift may occur.
If the PWCn and PWCnBF (n = 0–11) values are both FFFFH, and in high active status,
PWM becomes 1/65536 duty output when PWR is FFFFH. If the PWR value is de-
creased, the output duty ("H" level period) increases. If the PWR value is 0000H, output
becomes 65536/65536 at 100% duty. 0/65536, which is 0% duty, cannot be imple-
mented in a PWM block.
Содержание MSM66591
Страница 1: ...MSM66591 ML66592 User s Manual CMOS 16 bit microcontroller FEUL66591 66592 01 Issue Date Mar 4 2002...
Страница 15: ...Contents 12...
Страница 17: ......
Страница 18: ...Overview Chapter 1 1...
Страница 19: ......
Страница 30: ...Description of Pins Chapter 2 2...
Страница 31: ......
Страница 44: ...CPU Architecture Chapter 3 3...
Страница 45: ......
Страница 101: ...3 56 MSM66591 ML66592User sManual Chapter 3 CPU Architecture...
Страница 102: ...CPU Control Functions Chapter 4 4...
Страница 103: ......
Страница 111: ...4 8 MSM66591 ML66592User sManual Chapter 4 CPU Control Functions...
Страница 112: ...Memory Control Functions Chapter 5 5...
Страница 113: ......
Страница 117: ...5 4 MSM66591 ML66592User sManual Chapter 5 Memory Control Functions...
Страница 118: ...Port Functions Chapter 6 6...
Страница 119: ......
Страница 152: ...Output Pin Control Pin OE Chapter 7 7...
Страница 153: ......
Страница 155: ...7 2 MSM66591 ML66592User sManual Chapter 7 Output Pin Control Pin OE...
Страница 156: ...Clock Generation Circuit Chapter 8 8...
Страница 157: ......
Страница 160: ...Time Base Counter TBC Chapter 9 9...
Страница 161: ......
Страница 164: ...Watchdog Timer WDT Chapter 10 10...
Страница 165: ......
Страница 170: ...Flexible Timer FTM Chapter 11 11 11...
Страница 171: ......
Страница 213: ...11 42 MSM66591 ML66592User sManual Chapter 11 Flexible Timer FTM...
Страница 214: ...General Purpose 8 Bit Timer Function Chapter 12 12...
Страница 215: ......
Страница 223: ...12 8 MSM66591 ML66592User sManual Chapter 12 General Purpose 8 Bit Timer Function...
Страница 224: ...PWM Functions Chapter 13 13...
Страница 225: ......
Страница 244: ...Baud Rate Generator Functions Chapter 14 14...
Страница 245: ......
Страница 263: ...14 18 MSM66591 ML66592User sManual Chapter 14 Baud Rate Generator Functions...
Страница 264: ...Serial Port Functions Chapter 15 15...
Страница 265: ......
Страница 348: ...A D Converter Functions Chapter 16 16...
Страница 349: ......
Страница 381: ...16 32 MSM66591 ML66592User sManual Chapter 16 A D Converter Functions...
Страница 382: ...Transition Detector Functions Chapter 17 17...
Страница 383: ......
Страница 387: ...17 4 MSM66591 ML66592User sManual Chapter 17 Transition Detector Functions...
Страница 388: ...Peripheral Functions Chapter 18 18...
Страница 389: ......
Страница 392: ...External Interrupt Request Function Chapter 19 19...
Страница 393: ......
Страница 396: ...Interrupt Request Processing Function Chapter 20 20...
Страница 397: ......
Страница 407: ...20 10 MSM66591 ML66592User sManual Chapter 20 Interrupt Request Processing Function...
Страница 408: ...Bus Port Functions Chapter 21 21...
Страница 409: ......
Страница 413: ...21 4 MSM66591 ML66592User sManual Chapter 21 Bus Port Functions...
Страница 414: ...Expansion Port Chapter 22 22...
Страница 415: ......
Страница 420: ...Serial Port with FIFO SCI5 Chapter 23 23...
Страница 421: ......
Страница 431: ...23 10 MSM66591 ML66592User sManual Chapter 23 Serial Port with FIFO SCI5...
Страница 432: ...RAM Monitor Function Chapter 24 24...
Страница 433: ......
Страница 441: ...24 8 MSM66591 ML66592User sManual Chapter 24 RAM Monitor Function...
Страница 442: ...25 Electrical Characteristics Chapter 25...
Страница 443: ......
Страница 458: ...Package Dimensions Chapter 26 26...
Страница 459: ......
Страница 461: ...26 2 MSM66591 ML66592User sManual Chapter 26 Package Dimensions...
Страница 462: ...Revision History Chapter 27 27...
Страница 463: ......
Страница 465: ...27 2 MSM66591 ML66592User sManual Chapter 27 Revision History...