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SMBP2501BPB Datasheet(PDF) 87 Page - SONiX Technology Company |
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SMBP2501BPB Datasheet(HTML) 87 Page - SONiX Technology Company |
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87 / 107 page  SN8P2501B 8-Bit Micro-Controller SONiX TECHNOLOGY CO., LTD Page 87 Version 2.1 8.4 PWM0 MODE 8.4.1 OVERVIEW PWM function is generated by TC0 timer counter and output the PWM signal to PWM0OUT pin (P5.4). The 8-bit counter counts modulus 256, 64, 32, 16 controlled by ALOAD0, TC0OUT bits. The value of the 8-bit counter (TC0C) is compared to the contents of the reference register (TC0R). When the reference register value (TC0R) is equal to the counter value (TC0C), the PWM output goes low. When the counter reaches zero, the PWM output is forced high. The low-to-high ratio (duty) of the PWM0 output is TC0R/256, 64, 32, 16. PWM output can be held at low level by continuously loading the reference register with 00H. Under PWM operating, to change the PWM ’s duty cycle is to modify the TC0R. Note: TC0 is double buffer design. Modifying TC0R to change PWM duty by program, there is no glitch and error duty signal in PWM output waveform. Users can change TC0R any time, and the new reload value is loaded to TC0R buffer at TC0 overflow. ALOAD0 TC0OUT PWM duty range TC0C valid value TC0R valid bits value MAX. PWM Frequency (Fcpu = 4MHz) Remark 0 0 0/256~255/256 0x00~0xFF 0x00~0xFF 7.8125K Overflow per 256 count 0 1 0/64~63/64 0x00~0x3F 0x00~0x3F 31.25K Overflow per 64 count 1 0 0/32~31/32 0x00~0x1F 0x00~0x1F 62.5K Overflow per 32 count 1 1 0/16~15/16 0x00~0x0F 0x00~0x0F 125K Overflow per 16 count The Output duty of PWM is with different TC0R. Duty range is from 0/256~255/256. TC0 Clock TC0R=00H TC0R=01H TC0R=80H TC0R=FFH 0 1 128 254 255 …… …… 0 1 128 254 255 …… …… Low Low Low High High Low High |
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