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MC13211R2 bảng dữ liệu(PDF) 7 Page - Freescale Semiconductor, Inc |
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MC13211R2 bảng dữ liệu(HTML) 7 Page - Freescale Semiconductor, Inc |
7 / 70 page MC13211/212/213 Technical Data, Rev. 1.5 Freescale Semiconductor 7 1.7 System Clock Configuration The MC321x device allows for a wide array of system clock configurations: • Pins are provided for a separate external clock source for the CPU. The external clock source can by derived from a crystal oscillator or from an external clock source • Pins are provided for a 16 MHz crystal for the modem clock source (required) • The modem crystal oscillator frequency can be trimmed through programming to maintain the tight tolerances required by the 802.15.4 Standard • The modem provides a CLKO programmable frequency clock output that can be used as an external source to the CPU. As a result, a single crystal system clock solution is possible • Out of reset, the MCU uses an internally generated clock (approximately 8-MHz) for start-up. This allows recovery from stop or reset without a long crystal start-up delay • The MCU contains an internal clock generator (which can be trimmed) that can be used to run the MCU for low power operation. This internal reference is approximately 243 kHz Figure 2. MC1321x Single Crystal System Clock Structure 802.15.4 M O D E M HC S 0 8 M C U XTA L 1 X T A L 2 C L KO EX TA L X T A L M C 1321 X 27 28 10 98 16M H z |
Số phần tương tự - MC13211R2 |
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Mô tả tương tự - MC13211R2 |
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