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C505_9708 Datasheet(PDF) 88 Page - Siemens Semiconductor Group |
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C505_9708 Datasheet(HTML) 88 Page - Siemens Semiconductor Group |
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88 / 227 page  Semiconductor Group 6-26 1997-08-01 On-Chip Peripheral Components C505 / C505C The T2CON timer 2 control register is a bit-addressable register which controls the timer 2 function and the compare mode of registers CRC, CC1 to CC3. Special Function Register T2CON (Address C8H) Reset Value : 00X00000B Bit Function T2PS Prescaler select bit When set, timer 2 is clocked in the “timer“ or “gated timer“ function with 1/12 of the oscillator frequency. When cleared, timer 2 is clocked with 1/6 of the oscillator frequency. T2PS must be 0 for the counter operation of timer 2. I3FR External interrupt 3 falling / rising edge flag Used for capture function in combination with register CRC. If set, a capture to register CRC (if enabled) will occur on a positive transition at pin P1.0/AN0/INT3/ CC0 T2R1 T2R0 Timer 2 reload mode selection T2CM Compare mode bit for registers CRC, CC1 through CC3 When set, compare mode 1 is selected. T2CM = 0 selects compare mode 0. T2I1 T2I0 Timer 2 input selection CFH CEH CDH CCH CBH CAH C9H C8H T2PS I3FR – T2R1 C8H T2CON Bit No. 76543210 MSB LSB T2R0 T2CM T2I1 T2I0 The shaded bits are not used for controlling timer/counter 2. T2R1 T2R0 Function 0 X Reload disabled 1 0 Mode 0 : auto-reload upon timer 2 overflow (TF2) 1 1 Mode 1 : reload on falling edge at pin P1.5 / AN5 / T2EX T2I1 T2I0 Function 0 0 No input selected, timer 2 stops 0 1 Timer function : input frequency = fosc/6 (T2PS = 0) or fosc/12 (T2PS = 1) 1 0 Counter function : external input signal at pin P1.7 / AN7 / T2 1 1 Gated timer function : input controlled by pin P1.7 / AN7 / T2 |
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