ZHCS898O October 2003 – March 2019 TMS320F2801 , TMS320F28015 , TMS320F28016 , TMS320F2802 , TMS320F2806 , TMS320F2808 , TMS320F2809
PRODUCTION DATA.
请参考 PDF 数据表获取器件具体的封装图。
MIN | NOM | MAX | UNIT | ||||
---|---|---|---|---|---|---|---|
tw(RSL1)(1) | Pulse duration, stable XCLKIN to XRS high | 8tc(OSCCLK) | cycles | ||||
tw(RSL2) | Pulse duration, XRS low | Warm reset | 8tc(OSCCLK) | cycles | |||
tw(WDRS) | Pulse duration, reset pulse generated by watchdog | 512tc(OSCCLK) | cycles | ||||
td(EX) | Delay time, address/data valid after XRS high | 32tc(OSCCLK) | cycles | ||||
tOSCST(2) | Oscillator start-up time | 1 | 10 | ms | |||
th(boot-mode) | Hold time for boot-mode pins | 200tc(OSCCLK) | cycles |
Figure 5-8 shows an example for the effect of writing into PLLCR register. In the first phase, PLLCR = 0x0004 and SYSCLKOUT = OSCCLK x 2. The PLLCR is then written with 0x0008. Right after the PLLCR register is written, the PLL lock-up phase begins. During this phase, SYSCLKOUT = OSCCLK/2. After the PLL lock-up is complete (which takes 131072 OSCCLK cycles), SYSCLKOUT reflects the new operating frequency, OSCCLK x 4.