Renesas PCA7401 Technical Information download pdf (Page 24)

MITSUBISHI MICROCOMPUTERS

M37270MF-XXXSP

M37270EF-XXXSP, M37270EFSP

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

and ON-SCREEN DISPLAY CONTROLLER

Fig. 13. 8-bit PWM timing

(a) Pulses showing the weight of each

bit

13579 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

412 2028 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

56 72

88 104

120 136

152 168

184 200

216 232

248

160

224

192

Bit 7

14 18

22 26 30

46 50

54 58

62 66

74 78

82 86

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 µs T = 1024 µs

f(X

IN) = 8 MHz

(b) Example of 8-bit PWM

16 (0)

0116 (1)

16 (24)

FF16 (255)

T = 256 t

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 96 97

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