Renesas PCA7400 Manual de usuario descargar pdf (Pagina 25)

MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

Fig. 16. 8-bit PWM timing

(a) Pulses showing the weight of each bit

1 3 5 7 9 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 240 250 255

4 12 20 28 36 44 52 60 68 76 84 92 100 108 116 124 132 140 148 156 164 172 180 188 196 204 212 220 228 236 244 252

16 48 80 112 144 176 208 240

40 56

72 88

104 120

136 152

168 184

200 216

232 248

160

224

192

Bit 7

2 6 10 14 18 22 26 30 34 38 42 46 50 54 58 62 66 70 74 78 82 86 90 94 98 102 106 110 114 118 122 126 130 134 138 142 146 150 154 158 162 166 170 174 178 182 186 190 194 198 202 206 210 214 218 222 226 230 234 238 242 246 250 254

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

128

Bit 0

PWM output t = 4

s T = 1024

f(X

) = 8 MHz

(b) Example of 8-bit PWM

(0)

(1)

(24)

(255)

T = 256 t

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 97 98

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Renesas PCA7400 Manual de usuario Pagina 25

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