参数资料
型号: SPMC16V1CPU20
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 20.97 MHz, MICROCONTROLLER, PQFP100
封装: TQFP-100
文件页数: 45/128页
文件大小: 571K
代理商: SPMC16V1CPU20
MC68HC16V1
MOTOROLA
MC68HC16V1TS/D
23
In slow reference mode, one W bit and six Y bits are located in the PLL feedback path, enabling fre-
quency multiplication by a factor of up to 256. The X bit is located in the VCO clock output path to enable
dividing the system clock frequency by two without disturbing the PLL. Clock frequency is determined
by the following equation:
In fast reference mode, three W bits are located in the PLL feedback path, enabling frequency multipli-
cation by a factor from one to eight. Three Y bits and the X bit are located in the VCO clock output path
to provide the ability to slow the system clock without disturbing the PLL. Clock frequency is determined
by the following equation:
In external clock mode, three Y bits and the X bit are located between the EXTAL input and the system
clock, to allow slowing the clock for reduced power consumption. Clock frequency is determined by the
following equation:
For the device to perform correctly, the clock frequency selected by the W, X, and Y bits must be within
the limits specified for the MCU.
Internal VCO frequency is determined by the following equations:
or
f
sys
4f
ref Y1
+
() 2
2W
X
+
()
=
f
sys
f
ref W1
+
()
2X
() 2
Y
()
-----------------------------
, for Y
6
=
f
sys
f
ref
2X
() 2
Y
()
-----------------------------
, for Y
6
=
f
VCO
4f
sys if X = 0
=
f
VCO
2f
sys if X = 1
=
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