參數(shù)資料
型號： SPAK56F8346FV60
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 數(shù)字信號處理
英文描述： 16-BIT, 240 MHz, OTHER DSP, PQFP144
封裝： 20 X 20 MM, 0.50 MM PITCH, 1.40 MM HEIGHT, PLASTIC, LQFP-144
文件頁數(shù)： 12/156頁
文件大小： 2219K
代理商： SPAK56F8346FV60
109
56F8346 Technical Data
MOTOROLA
Preliminary
Refer to the PCE register in Section 6.5.9 and ADC power modes. Power is a function of the system
frequency which can be controlled through the OCCS.
6.8 Stop and Wait Mode Disable Function
Figure 6-16 Internal Stop Disable Circuit
The 56800E core contains both STOP and WAIT instructions. Both put the CPU to sleep. For lowest power
consumption in Stop mode, the PLL can be shut down. This must be done explicitly before entering Stop
mode, since there is no automatic mechanism for this. When the PLL is shut down, the 56800E system clock
must be set equal to the prescaler output.
Some applications require the 56800E STOP/WAIT instructions be disabled. To disable those instructions,
write to the SIM control register (SIM_CONTROL) described in Section 6.5.1. This procedure can be on
either a permanent or temporary basis. Permanently assigned applications last only until their next reset.
6.9 Resets
The SIM supports four sources of reset. The two asynchronous sources are the external reset pin and the
Power-On Reset (POR). The two synchronous sources are the software reset, which is generated within the
SIM itself by writting to the SIM_CONTROL register, and the COP reset.
Using an 8MHz crystal, the longest reset time is roughly 1/4 second. The first mode is designed to allow
sufficient time for the crystal frequency to stabilize before enabling the rest of the chip. In all other cases,
the default delays are set to 64 clock cycles. Alternately, an external reset generation chip may be used.
Resets may be asserted asynchronously, but they are always released internally on a rising edge of the
system clock.
D-FLOP
DQ
C
D-FLOP
D
Q
C
R
56800E
STOP_DIS
Permanent
Disable
Reprogrammable Disable
Clock
Select
RESET
Note: Wait disable circuit is similar
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