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參數(shù)資料
| 型號： | SCF5250CPV120 |
| 廠商： | Motorola, Inc. |
| 英文描述： | SCF5250 Integrated ColdFire Microprocessor |
| 中文描述： | SCF5250提供了集成的ColdFire微處理器 |
| 文件頁數(shù)： | 5/48頁 |
| 文件大?。?/td> | 767K |
| 代理商： | SCF5250CPV120 |
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Introduction
SCF5250 Integrated ColdFire Microprocessor Data Sheet, Rev. 1.1
Freescale Semiconductor
5
Insertion of the CRC checksum for Mode 1, Mode 2 Form 1, and Mode 2 Form 2 sectors.
Third-layer error encoding needs to be done in software. This can use approximately 5-10 Mhz of
performance for single-speed.
1.2.13 Dual UART Module
Two full-duplex UARTs with independent receive and transmit buffers are in this module. Data formats
can be 5, 6, 7, or 8 bits with even, odd, or no parity, and up to 2 stop bits in 1/16 increments. Four-byte
receive buffers and two-byte transmit buffers minimize CPU service calls. The Dual UART module also
provides several error-detection and maskable-interrupt capabilities. Modem support includes
request-to-send (RTS) and clear-to-send (CTS) lines.
The system clock provides the clocking function from a programmable prescaler. You can select full
duplex, auto-echo loopback, local loopback, and remote loopback modes. The programmable Dual UARTs
can interrupt the CPU on various normal or error-condition events.
1.2.14 Queued Serial Peripheral Interface QSPI
The QSPI module provides a serial peripheral interface with queued transfer capability. It supports up to
16 stacked transfers at a time, making CPU intervention between transfers unnecessary. Transfers of up to
15 Mbits/second are possible at a CPU clock of 120 MHz. The QSPI supports master mode operation only.
1.2.15 Timer Module
The timer module includes two general-purpose timers, each of which contains a free-running 16-bit timer.
Timer0 has an external pin TOUT0, which can be used in Output Compare mode. This mode triggers an
external signal or interrupts the CPU when the timer reaches a set value, and can also generate waveforms
on TOUT0.
The timer unit has an 8-bit prescaler that allows programming of the clock input frequency, which is
derived from the system clock. In addition to the ÷1 and ÷16 clock derived from the bus clock (CPU clock
/ 2), the programmable timer-output pins either generate an active-low pulse or toggle the outputs.
1.2.16 IDE and SmartMedia Interfaces
The SCF5250 system bus allows connection of an IDE hard disk drive or SmartMedia flash card with a
minimum of external hardware. The external hardware consists of bus buffers for address and data and are
intended to reduce the load on the bus and prevent SDRAM and Flash accesses to propagate to the IDE
bus. The control signals for the buffers are generated in the SCF5250.
1.2.17 Analog/Digital Converter (ADC)
The six channel ADC is a based on the Sigma-Delta concept with 12-bit resolution. Both the analogue
comparator and digital sections of the ADC are provided internally. An external integrator circuit
(resistor/capacitor) is required, which is driven by the ADC output. A software interrupt is provided when
the ADC measurement cycle is complete.
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