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| 型号： | SAK-XC167CI-16F40F |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP144 |
| 封装： | 0.50 MM PITCH, GREEN, PLASTIC, TQFP-144 |
| 文件页数： | 69/90页 |
| 文件大小： | 1187K |
| 代理商： | SAK-XC167CI-16F40F |
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XC167CI-16F
Derivatives
Electrical Parameters
Data Sheet
69
V1.3, 2006-08
The specification of the external timing (AC Characteristics) depends on the period of the
CPU clock, called “TCP”.
The other peripherals are supplied with the system clock signal
f
SYS which has the same
frequency as the CPU clock signal
f
CPU.
Bypass Operation
When bypass operation is configured (PLLCTRL = 0xB) the master clock is derived from
the internal oscillator (input clock signal XTAL1) through the input- and output-
prescalers:
f
MC = fOSC / ((PLLIDIV+1) × (PLLODIV+1)).
If both divider factors are selected as ‘1’ (PLLIDIV = PLLODIV = ‘0’) the frequency of
f
MC
directly follows the frequency of
f
OSC so the high and low time of fMC is defined by the duty
cycle of the input clock
f
OSC.
The lowest master clock frequency is achieved by selecting the maximum values for both
divider factors:
f
MC = fOSC / ((3 + 1) × (14 + 1)) = fOSC / 60.
Phase Locked Loop (PLL)
When PLL operation is configured (PLLCTRL = 11B) the on-chip phase locked loop is
enabled and provides the master clock. The PLL multiplies the input frequency by the
factor F (
f
MC = fOSC × F) which results from the input divider, the multiplication factor, and
the output divider (F = PLLMUL+1 / (PLLIDIV+1
× PLLODIV+1)). The PLL circuit
synchronizes the master clock to the input clock. This synchronization is done smoothly,
i.e. the master clock frequency does not change abruptly.
Due to this adaptation to the input clock the frequency of
f
MC is constantly adjusted so it
is locked to
f
OSC. The slight variation causes a jitter of fMC which also affects the duration
of individual TCMs.
The timing listed in the AC Characteristics refers to TCPs. Because
f
CPU is derived from
f
MC, the timing must be calculated using the minimum TCP possible under the respective
circumstances.
The actual minimum value for TCP depends on the jitter of the PLL. As the PLL is
constantly adjusting its output frequency so it corresponds to the applied input frequency
(crystal or oscillator) the relative deviation for periods of more than one TCP is lower than
for one single TCP (see formula and Figure 16).
This is especially important for bus cycles using waitstates and e.g. for the operation of
timers, serial interfaces, etc. For all slower operations and longer periods (e.g. pulse train
generation or measurement, lower baudrates, etc.) the deviation caused by the PLL jitter
is negligible.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SAK-XC167CI-16F40F BB | 功能描述:16位微控制器 - MCU 16 BIT SNGL CHIP 5V 40MHz Flash RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT |
| SAKXC167CI16F40FBB | 制造商:Infineon Technologies AG 功能描述: |
| SAK-XC167CI-16F40FBB | 制造商:Infineon Technologies AG 功能描述: |
| SAKXC167CI16F40FBBTR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Infineon Technologies AG 功能描述: |
| SAKXC167CI16F40FTR | 制造商:Infineon Technologies AG 功能描述:MCU 16-Bit XC166 CISC/DSP/RISC 128KB Flash 2.5V/5V 144-Pin TQFP T/R |
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