参数资料
型号: DSP56F802TA80E
厂商: Freescale Semiconductor
文件页数: 15/40页
文件大小: 0K
描述: IC DSP 60MHZ 16KB FLASH 32-LQFP
标准包装: 250
系列: 56F8xx
核心处理器: 56800
芯体尺寸: 16-位
速度: 80MHz
连通性: SCI
外围设备: POR,PWM,WDT
输入/输出数: 8
程序存储器容量: 20KB(10K x 16)
程序存储器类型: 闪存
RAM 容量: 2K x 16
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 5x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 32-LQFP
包装: 托盘
56F802 Technical Data, Rev. 9
22
Freescale Semiconductor
Figure 3-6 Flash Mass Erase Cycle
3.5 Clock Operation
The 56F802 device clock is derived from an on-chip relaxation oscillator. The internal PLL generates a
master reference frequency that determines the speed at which chip operations occur.
The PRECS bit in the PLLCR (phase-locked loop control register) word (bit 2) must be set to 0 for internal
oscillator use.
3.5.1
Use of On-Chip Relaxation Oscillator
The 56F802 internal relaxation oscillator provides the chip clock without the need for an external crystal
or ceramic resonator. The frequency output of this internal oscillator can be corrected by adjusting the 8-bit
IOSCTL (internal oscillator control) register. Each bit added or deleted changes the output frequency of
the oscillator allowing incremental adjustment until the desired frequency is achieved. Figures 9 and 10
show the typical characteristics of the 56F802 relaxation oscillator with respect to temperature and trim
value.
During factory production test, an oscillator calibration procedure is executed which determines an
optimum trim value for a given device (8MHz at 25oC). This optimum trim value is then stored at address
$103F in the Data Flash Information Block and recalled during a trim routine in the boot sequence
(executed after power-up and RESET). This trim routine automatically sets the oscillator frequency by
programming the IOSCTL register with the optimum trim value.
XADR
YE=SE=OE=0
ERASE
NVSTR
Tnvs
Tnvh1
Trcv
Tme
MAS1
IFREN
XE
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