参数资料
型号: ADUC7032BSTZ-88-RL
厂商: Analog Devices Inc
文件页数: 83/120页
文件大小: 0K
描述: IC MCU 96K FLASH DUAL 48LQFP
标准包装: 2,000
系列: MicroConverter® ADuC7xxx
核心处理器: ARM7
芯体尺寸: 16/32-位
速度: 20.48MHz
连通性: LIN,SPI,UART/USART
外围设备: POR,PSM,温度传感器,WDT
输入/输出数: 9
程序存储器容量: 96KB(48K x 16)
程序存储器类型: 闪存
RAM 容量: 1.5K x 32
电压 - 电源 (Vcc/Vdd): 3.5 V ~ 18 V
数据转换器: A/D 2x16b
振荡器型: 内部
工作温度: -40°C ~ 105°C
封装/外壳: 48-LQFP
包装: 带卷 (TR)
ADuC7032-8L
Rev. A | Page 65 of 120
ADUC7032-8L LOW POWER CLOCK CALIBRATION
The low power 131 kHz oscillator can be calibrated using either
the precision 131 kHz oscillator or an external 32.768 kHz
watch crystal. Two dedicated calibration counters and an oscil-
lator trim register are used to implement this feature.
One counter, nine bits wide, is clocked by either the precision
oscillator or the external watch crystal. The second counter, 10
bits wide, is clocked by the low power oscillator, either directly
at 131 kHz or via a divide-by-4 block generating 32.768 kHz.
The source for each calibration counter should be of the same
frequency. The trim register (OSC0TRM) is an 8-bit wide
register, the lower four bits of which are user-accessible trim
bits. Increasing the value in OSCT0RM decreases the frequency
of the low power oscillator; decreasing the value increases the
frequency. Based on a nominal frequency of 131 kHz, the typical
trim range is 127 kHz to 135 kHz.
The clock calibration mode is configured and controlled by the
following MMRs:
OSC0CON: control bits for calibration
OSC0STA: calibration status register
OSC0VAL0: 9-bit counter, Counter 0
OSC0VAL1: 10-bit counter, Counter 1
OSC0TRM: oscillator trim register
An example calibration routine is shown in Figure 28. User code
configures and enables the calibration sequence via OSC0CON.
When the precision oscillator calibration counter, OSC0VAL0,
reaches 0x1FF, both counters are disabled.
User code then reads back the value of the low power oscillator
calibration counter. There are three possible scenarios.
OSC0VAL0 = OSC0VAL1: No further action is required.
OSC0VAL0 > OSC0VAL1: The low power oscillator is
running slow. OSC0TRM must be decreased.
OSC0VAL0 < OSC0VAL1: The low power oscillator is
running fast. OSC0TRM must be increased.
When the OSC0TRM has been changed, the routine should be
rerun and the new frequency checked.
Using the internal precision 131 kHz oscillator, it takes
approximately 4 ms to execute the calibration routine. If the
external 32.768 kHz crystal is used, the time increases to 16 ms.
Note that prior to the clock calibration routine being started,
it is required that the user switch to either the precision 131 kHz
oscillator or the external 32.768 kHz watch crystal as the PLL
clock source. If this is not done, the PLL may lose lock each
time OSC0TRM is modified. This increases the length of time it
takes to calibrate the low power oscillator.
BEGIN
CALIBRATION
ROUTINE
WHILE
OSC0STA[0] = 1
INCREASE
OSC0TRM
DECREASE
OSC0TRM
OSC0VAL0 < OSC0VAL1
OSC0VAL0 > OSC0VAL1
END
CALIBRATION
ROUTINE
IS ERROR WITHIN
DESIRED LEVEL?
OSC0VAL0 = OSC0VAL1
NO
YES
05
98
6-
0
28
Figure 28. Example OSC0TRM Calibration Routine
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