Jameco-electronics Rabbit 3000 Manual de usuario descargar pdf (Pagina 113)

100

101

104 Rabbit 3000 Microprocessor

Table 7-17. PWM LSB x Register

PWM LSB x Register (PWL0R) (Address = 0x88)

(PWL1R) (Address = 0x8A)

(PWL2R) (Address = 0x8C)

(PWL3R) (Address = 0x8E)

Bit(s) Value Description

7:6 write The least significant two bits for the Pulse Width Modulator count are stored.

5:1 These bits are ignored.

0 0 PWM output High for single block.

1 Spread PWM output throughout the cycle.

Table 7-18. PWM MSB x Register

PWM MSB x Register (PWM0R) (Address = 0x89)

(PWM1R) (Address = 0x8B)

(PWM2R) (Address = 0x8D)

(PWM3R) (Address = 0x8F)

Bit(s) Value Description

7:0 write

The most significant eight bits for the Pulse Width Modulator count are stored.

With a count of "n", the PWM output will be High for "n + 1" clocks out of the

1024 clocks of the PWM counter.

n=255, normal

n=256, spread

n=255, spread

(256 counts)

(64 counts) (64 counts) (64 counts) (64 counts)

(65 counts) (64 counts) (64 counts) (64 counts)

n=257, spread (65 counts) (64 counts) (65 counts) (64 counts)

n=258, spread (65 counts) (65 counts) (65 counts) (64 counts)

n=259, spread (65 counts) (65 counts) (65 counts) (65 counts)

n=259, normal (260 counts)

1 2 ... 108 109 110 111 112 113 114 115 116 117 118 ... 348 349

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