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AS8228 Datasheet(PDF) 97 Page - ams AG |
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AS8228 Datasheet(HTML) 97 Page - ams AG |
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97 / 123 page  Data Sheet AS8218 / AS8228 Revision 3.0, 31-May-06 Page 97 of 123 T0PRE CT_N = 0 CT_N = 1 TR0 TL0 (5 bits) TH0 (8 bits) TF0 Control Timer 0 Interrupt mcu_clk (8bits) *) 1 6 1 N mcu_clk x x 6 : N : Figure 25: Timer 0 Mode 0 and Mode 1 *) : 13 bit counter T0PRE CT_N = 0 CT_N = 1 TR0 TL0 (8 bits) TF0 Control Timer 0 Interrupt mcu_clk clk _ mcu 6 1 TH0 (8 bits) Reload 1 6 1 N mcu_clk xx 6 : N : Figure 26: Timer 0 Mode 2: 8 bit counter T0PRE CT_N = 0 CT_N = 1 TR0 TL0 (8 bits) TF0 Control Timer 0 Interrupt mcu_clk clk _ mcu 6 1 TR1 Control TH0 (8 bits) TF1 1 6 1 N mcu_clk x x 6 : N : Figure 27: Timer 0 Mode 3: two 8 bit counters T0PRE Unlike the standard 8051 there is a 8-bit prescaler register available for timer 0. Values of 0x00 (default after reset) and 0x01 do not have any effect. For all other values the timer input frequency is divided according to the value (ranging from 2 up to 255). |
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