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i have a tlc555 timer pulsing at pin 7 (count down). i have grounded pins 4 (toggle enable), 5 (reset), 9 (clock up). i have set pin 6 (latch enable) to the Vcc. and the remaining pins driving the anodes of the seven segment display. but the display never changes up / down. the literature on the chip is weird because they don't say anything about the functions of 'toggle enable' or 'latch enable'. i would think they should at least mention it. any ideas?