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SN8F27E64KB Datasheet(PDF) 95 Page - SONiX Technology Company |
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SN8F27E64KB Datasheet(HTML) 95 Page - SONiX Technology Company |
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95 / 192 page  SN8F27E60 Series 8-Bit Flash Micro-Controller with Embedded ICE and ISP SONiX TECHNOLOGY CO., LTD Page 95 Version 1.4 8.3.5 TC0R AUTO-RELOAD REGISTER TC0 timer builds in auto-reload function, and TC0R register stores reload data. When TC0C overflow occurs, TC0C register is loaded data from TC0R register automatically. Under TC0 timer counting status, to modify TC0 interval time is to modify TC0R register, not TC0C register. New TC0C data of TC0 interval time will be updated after TC0 timer overflow occurrence, TC0R loads new value to TC0C register. But at the first time to setup TC0M, TC0C and TC0R must be set the same value before enabling TC0 timer. TC0 is double buffer design. If new TC0R value is set by program, the new value is stored in 1 st buffer. Until TC0 overflow occurs, the new value moves to real TC0R buffer. This way can avoid any transitional condition to affect the correctness of TC0 interval time and PWM output signal. 0B6H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 TC0R TC0R7 TC0R6 TC0R5 TC0R4 TC0R3 TC0R2 TC0R1 TC0R0 Read/Write W W W W W W W W After reset 0 0 0 0 0 0 0 0 The equation of TC0R initial value is as following. TC0R initial value = 256 - (TC0 interrupt interval time * TC0 clock rate) Example: To calculation TC0C and TC0R value to obtain 10ms TC0 interval time. TC0 clock source is Fcpu = 16MHz/16 = 1MHz. Select TC0RATE=000 (Fcpu/128). TC0 interval time = 10ms. TC0 clock rate = 16MHz/16/128 TC0C/TC0R initial value = 256 - (TC0 interval time * input clock) = 256 - (10ms * 16MHz / 16 / 128) = 256 - (10-2 * 16 * 106 / 16 / 128) = B2H 8.3.6 TC0D PWM DUTY REGISTER TC0D register ’s purpose is to decide PWM duty. In PWM mode, TC0R controls PWM’s cycle, and TC0D controls the duty of PWM. The operation is base on timer counter value. When TC0C = TC0D, the PWM high duty finished and exchange to low level. It is easy to configure TC0D to choose the right PWM ’s duty for application. 0B7H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 TC0D TC0D7 TC0D6 TC0D5 TC0D4 TC0D3 TC0D2 TC0D1 TC0D0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W After Reset 0 0 0 0 0 0 0 0 The equation of TC0D initial value is as following. TC0D initial value = TC0R + (PWM high pulse width period / TC0 clock rate) Example: To calculate TC0D value to obtain 1/3 duty PWM signal. The TC0 clock source is Fcpu = 16MHz/16= 1MHz. Select TC0RATE=000 (Fcpu/128). TC0R = B2H. TC0 interval time = 10ms. So the PWM cycle is 100Hz. In 1/3 duty condition, the high pulse width is about 3.33ms. TC0D initial value = B2H + (PWM high pulse width period / TC0 clock rate) = B2H + (3.33ms * 16MHz / 16 / 128) = B2H + 1AH = CCH |
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