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C511 Datasheet(PDF) 57 Page - Siemens Semiconductor Group |
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C511 Datasheet(HTML) 57 Page - Siemens Semiconductor Group |
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57 / 128 page  Semiconductor Group 6-24 On-Chip Peripheral Units 6.2.2.1 Auto-Reload Mode (Up or Down Counter) Timer 2 can be programmed to count up or down when configured in its 16-bit auto-reload mode. This feature is invoked by a bit named DCEN (Down Counter Enable), which is located in SFR T2MOD. When DCEN is set, timer 2 can count up or down depending on the value of pin T2EX (P1.1). Special Function Register T2MOD (Address C9H) Reset Value : XXXXXXX0B Figure 6-23 shows timer 2 automatically counting up when DCEN=0. In this mode there are two options selectable by bit EXEN2 in SFR T2CON. Figure 6-23 Timer 2 Auto-Reload Mode (DCEN = 0) Bit Function – Not implemented, reserved for future use. DCEN When set, this bit allows timer 2 to be configured as an up/down counter. With T2EX=0 down-counting is selected, with DCEN=1 up-counting is enabled. – ––– C9H T2MOD Bit No. 7 65 43 21 0 MSB LSB –– – DCEN |
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