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M38B53M4-059FP Datasheet(PDF) 71 Page - Mitsubishi Electric Semiconductor |
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M38B53M4-059FP Datasheet(HTML) 71 Page - Mitsubishi Electric Semiconductor |
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71 / 355 page  38B5 Group User’s Manual 1-55 HARDWARE FUNCTIONAL DESCRIPTION Fig. 59 14-bit PWM timing Fig. 58 Structure of PWM control register P87/PWM output selection bit 0: I/O port 1: PWM output Not used (return “0” when read) PWM control register (PWMCON: address 002616) b7 b0 6A 6A 6A 6A 6A 6B 6A 6A 6A 6A 6A 6A 6A 6A 6B 6B 6B 6B 6B 6B 6B 6B 6B 6B 6B 6B 6B 5 5 5 5 5 5 5 5 5 5 5 5 5 5 6A 6A 6B 6B 6B 6A 6B 6B 6B 6A 6B 6B 6B 6A 6A 6A 6A 6A 6A 6A 6A 6A 6A 6A 6A 6A 6A 4 3 4 4 3 4 4 3 4 6B 6A 69 68 67 02 01 6A 69 68 67 02 01 02 01 00 FF FE FD 97 96 95 02 01 00 FC FF FE FD 97 96 95 FC ADD ADD 165316 1A9316 1AA416 1AA416 1EE416 1EF516 T = 4096 µs t = 64 µs 1316 A416 2416 3516 7B16 6A16 5916 Data 3516 stored at address 001516 t = 64 µs τ = 0.25 µs “H” period length specified by PWMH 1 2 B516 2 PWM register (high-order) PWM register (low-order) PWM latch (14-bit) Data 6A16 stored at address 001416 Data 2416 stored at address 001516 Bit 7 cleared after transfer Transfer from register to latch Data 7B16 stored at address 001416 Transfer from register to latch When bit 7 of PWML is “0,” transfer from register to latch is disabled. PWM output (Example 1) Low-order 6-bits output H = 6A16 L = 2416 6B16............36 times (107) 6A16............28 times (106) PWM output (Example 2) Low-order 6 bits output H = 6A16 L = 1816 6B16............24 times 6A16............40 times PWM output 8-bit counter The ADD portions with additional τ are determined either “H” or “L” by low-order 6-bit data. Minimum bit width (64 64 µs) ! 106 ! 64 + 24 (256 0.25 µs) 256 (64 µs), fixed τ 106 ! 64 + 36 ! ......... .......... .......... .......... .......... ............ |
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