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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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MC68340 bảng dữ liệu(PDF) 313 Page - Freescale Semiconductor, Inc |
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MC68340 bảng dữ liệu(HTML) 313 Page - Freescale Semiconductor, Inc |
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313 / 441 page  7- 18 MC68340 USER’S MANUAL MOTOROLA NOTE All serial module registers are only accessible as bytes. The contents of the mode registers (MR1 and MR2), clock-select register (CSR), and the auxiliary control register (ACR) bit 7 should only be changed after the receiver/transmitter is issued a software RESET command—i.e., channel operation must be disabled. Care should also be taken if the register contents are changed during receiver/transmitter operations, as undesirable results may be produced. In the registers discussed in the following pages, the numbers in the upper right-hand corner indicate the offset of the register from the base address specified in the module base address register (MBAR) in the SIM40. The numbers above the register description represent the bit position in the register. The register description contains the mnemonic for the bit. The values shown below the register description are the values of those register bits after a hardware reset. A value of U indicates that the bit value is unaffected by reset. The read/write status and the access privilege are shown in the last line. NOTE A CPU32 RESET instruction will not affect the MCR, but will reset all the other serial module registers as though a hardware reset had occurred. The module is enabled when the STP bit in the MCR is cleared. The module is disabled when the STP bit in the MCR is set. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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