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TMDXDOCK28069 Datasheet(PDF) 48 Page - Texas Instruments |
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TMDXDOCK28069 Datasheet(HTML) 48 Page - Texas Instruments |
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48 / 147 page  TMS320F2809, TMS320F2808, TMS320F2806 TMS320F2802, TMS320F2801, TMS320C2802 TMS320C2801, TMS320F28016, TMS320F28015 SPRS230N – OCTOBER 2003 – REVISED MAY 2012 www.ti.com 3.6.1.2 PLL-Based Clock Module The 280x devices have an on-chip, PLL-based clock module. This module provides all the necessary clocking signals for the device, as well as control for low-power mode entry. The PLL has a 4-bit ratio control PLLCR[DIV] to select different CPU clock rates. The watchdog module should be disabled before writing to the PLLCR register. It can be re-enabled (if need be) after the PLL module has stabilized, which takes 131072 OSCCLK cycles. Table 3-16. PLLCR Register Bit Definitions SYSCLKOUT PLLCR[DIV](1) (CLKIN)(2) 0000 (PLL bypass) OSCCLK/n 0001 (OSCCLK*1)/n 0010 (OSCCLK*2)/n 0011 (OSCCLK*3)/n 0100 (OSCCLK*4)/n 0101 (OSCCLK*5)/n 0110 (OSCCLK*6)/n 0111 (OSCCLK*7)/n 1000 (OSCCLK*8)/n 1001 (OSCCLK*9)/n 1010 (OSCCLK*10)/n 1011–1111 Reserved (1) This register is EALLOW protected. (2) CLKIN is the input clock to the CPU. SYSCLKOUT is the output clock from the CPU. The frequency of SYSCLKOUT is the same as CLKIN. If CLKINDIV = 0, n = 2; if CLKINDIV = 1, n = 1. NOTE PLLSTS[CLKINDIV] enables or bypasses the divide-by-two block before the clock is fed to the core. This bit must be 0 before writing to the PLLCR and must only be set after PLLSTS[PLLLOCKS] = 1. The PLL-based clock module provides two modes of operation: • Crystal-operation - This mode allows the use of an external crystal/resonator to provide the time base to the device. • External clock source operation - This mode allows the internal oscillator to be bypassed. The device clocks are generated from an external clock source input on the X1 or the XCLKIN pin. 48 Functional Overview Copyright © 2003–2012, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TMS320F2809 TMS320F2808 TMS320F2806 TMS320F2802 TMS320F2801 TMS320C2802 TMS320C2801 TMS320F28016 TMS320F28015 |
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