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M38B57MC Fiches technique(PDF) 48 Page - Mitsubishi Electric Semiconductor |
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M38B57MC Fiches technique(HTML) 48 Page - Mitsubishi Electric Semiconductor |
48 / 69 page MITSUBISHI MICROCOMPUTERS 38B5 Group SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER 48 PRELIMINAR Y Notice: This is not a final specification. Some parametric limits are subject to change. Pulse Width Modulation (PWM) The 38B5 group has a PWM function with a 14-bit resolution. When the oscillation frequency XIN is 4 MHz, the minimum resolution bit width is 250 ns and the cycle period is 4096 µs. The PWM timing generator supplies a PWM control signal based on a signal that is the frequency of the XIN clock. The explanation in the rest of this data sheet assumes XIN = 4 MHz. 14 1/2 XIN (4MHz) P87/PWM0 bit7 bit0 bit5 MSB LSB PWM bit7 bit0 Data bus XCIN “1” “0” PWM register (high-order) (address 001416) PWM register (low-order) (address 001516) It is set to “1” when write. PWM latch (14-bit) 14-bit PWM circuit When an internal system clock selection bit is set to “0” Timing generating unit for PWM (64 µs cycle) (4096 µs cycle) P87/PWM output selection bit P87 direction register P87/PWM output selection bit P87 latch Fig. 53 PWM Block Diagram |
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