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MC68340 データシート(PDF) 32 Page - Freescale Semiconductor, Inc |
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MC68340 データシート(HTML) 32 Page - Freescale Semiconductor, Inc |
32 / 441 page 1- 8 MC68340 USER’S MANUAL MOTOROLA Each communication channel is completely independent. Data formats can be 5, 6, 7, or 8 bits with even, odd, or no parity and stop bits up to 2 in 1/16 increments. Four-byte receive buffers and two-byte transmit buffers minimize CPU service calls. A wide variety of error detection and maskable interrupt capability is provided on each channel. Full-duplex, autoecho loopback, local loopback, and remote loopback modes can be selected. Multidrop applications are supported. A 3.6864-MHz crystal drives the baud rate generators. Each transmit and receive channel can be programmed for a different baud rate, or an external 1 × and 16× clock input can be selected. Full modem support is provided with separate request-to-send (RTS) and clear- to-send (CTS) signals for each channel. One channel also provides service request signals. The two serial ports can sustain rates of 9.8 Mbps with a 25-MHz system clock in 1 × mode, 612 kbps in 16× mode (6.5 Mbps and 410 kbps @ 16.78 MHz). 1.3.4 Timer Modules Timers and counters are used in a system to monitor elapsed time, generate waveforms, measure signals, keep time-of-day clocks, initiate DRAM refresh cycles, count events, and provide “time slices” to ensure that no task dominates the activity of the processor. A counter that counts clock pulses makes a timer, which is most useful when it causes certain actions to occur in response to reaching desired counts. The MC68340 has two, identical, versatile, on-chip counter/timers as well as a simple timer in the SIM40. These general-purpose counter/timers can be used for precisely timed events without the errors to which software-based counters and timers are susceptible— e.g., errors caused by dynamic memory refreshing, DMA cycle steals, and interrupt servicing. The programmable timer operating modes are input capture, output compare, square-wave generation, variable duty-cycle square-wave generation, variable-width single-shot pulse generation, event counting, period measurement, and pulse-width measurement. Each timer consists of a 16-bit countdown counter with an 8-bit countdown prescaler for a composite 24-bit resolution. The two timers can be externally cascaded for a maximum count width of 48 bits. The counter/timer can be clocked by the internal system clock generated by the SIM40 ( ÷2) or by an external clock input. Either the processor or external stimuli can trigger the starting and stopping of the counter. When a counter reaches a predetermined value, either an external output signal can be driven, or an interrupt can be made to the CPU32. The finest resolution of the timer is 80 ns with a 25-MHz system clock (125 ns @ 16.78 MHz). 1.4 POWER CONSUMPTION MANAGEMENT The MC68340 is very power efficient due to its advanced 0.8- µ HCMOS process technology and its static logic design. The resulting power consumption is typically 900 mW in full operation @ 25 MHz (650 mW @ 16.78 MHz)—far less than the comparable discrete component implementation the MC68340 can replace. For applications employing reduced voltage operation, selection of the MC68340V, which Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
同様の部品番号 - MC68340 |
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同様の説明 - MC68340 |
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