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A decade counter may have each (that is, it may count in binary-coded decimal, as the 7490 integrated circuit did) or other binary encodings. A decade counter is a binary counter designed to count to 1001 (decimal 9). An ordinary four-stage counter can be easily modified to a decade counter by adding a NAND gate as in the schematic to the right.
synchronous presettable up/down 4-bit decade counter, clear 16 SN74LS192: 74x193 1 synchronous presettable up/down 4-bit binary counter, clear 16 SN74LS193: 74x194 1 4-bit bidirectional universal shift register 16 SN74194: 74x195 1 4-bit parallel-access shift register 16 SN74195: 74x196 1 presettable 4-bit decade counter/latch 14 SN74196: 74x197 1
For power-of-2 integer division, a simple binary counter can be used, clocked by the input signal. The least-significant output bit alternates at 1/2 the rate of the input clock, the next bit at 1/4 the rate, the third bit at 1/8 the rate, etc. An arrangement of flipflops is a classic method for integer-n division. Such division is frequency ...
The counter acts as a frequency divider, counting pulses from a high frequency master clock (typically several MHz) and toggling the state of its output when the count reaches some predetermined value. The frequency of the counter's output can thus be defined by the number of pulses counted, and this generates a square wave at the required ...
A very early CD4029A counter IC, in 16-pin ceramic dual in-line package (DIP-16), manufactured by RCA Colorized IC die and schematics of CD4011BE NAND gate. The 4000 series was introduced as the CD4000 COS/MOS series in 1968 by RCA [1] as a lower power and more versatile alternative to the 7400 series of transistor-transistor logic (TTL) chips.
The system also includes several special-purpose registers: an 18-bit Instruction Counter (IC) and a 27-bit Timer Register (TR) with a resolution of 2 μs. Sets of special registers are used for fault detection and debugging. The EIS instruction set adds eight additional 24-bit registers AR0 through AR7.
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The VIA provides two 16-bit timer/counters. Each can be used in one-shot "interval timer" mode; timer 1 can also be used in "free-running" (divider/square wave) mode, in which the timer is automatically reloaded with the initial count when it reaches zero, and timer 2 can also be used in "pulse counting" mode, in which the timer will count the high-to-low state transitions of pin PB6 (the 7th ...