参数资料
型号: MC56F8145VFG
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 数字信号处理
英文描述: 4-BIT, 120 MHz, OTHER DSP, PQFP128
封装: PLASTIC, LQFP-128
文件页数: 16/172页
文件大小: 871K
代理商: MC56F8145VFG
56F8345 Technical Data, Rev. 17
112
Freescale Semiconductor
Preliminary
6.5.6.14
Reserved—Bit 2–0
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
6.5.7
CLKO Select Register (SIM_CLKOSR)
The CLKO select register can be used to multiplex out any one of the clocks generated inside the clock
generation and SIM modules. The default value is SYS_CLK. This path has been optimized in order to
minimize any delay and clock duty cycle distortion. All other clocks primarily muxed out are for test
purposes only, and are subject to significant phase shift at high frequencies.
The upper four bits of the GPIOB register can function as GPIO, [A23:A20], or as additional clock output
signals. GPIO has priority and is enabled/disabled via the GPIOB_PER. If GPIOB[7:4] are programmed
to operate as peripheral outputs, then the choice between [A23:A20] and additional clock outputs is done
here in the CLKOSR. The default state is for the peripheral function of GPIOB[7:4] to be programmed as
[A23:A20]. This can be changed by altering [A23:A20], as shown in Figure 6-9.
Figure 6-9 CLKO Select Register (SIM_CLKOSR)
6.5.7.1
Reserved—Bits 15–10
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
6.5.7.2
Alternate GPIO_B Peripheral Function for A23 (A23)—Bit 9
0 = Peripheral output function of GPIOB[7] is defined to be A[23]
1 = Peripheral output function of GPIOB[7] is defined to be the oscillator clock (MSTR_OSC, see
6.5.7.3
Alternate GPIO_B Peripheral Function for A22 (A22)—Bit 8
0 = Peripheral output function of GPIOB[6] is defined to be A[22]
1 = Peripheral output function of GPIOB[6] is defined to be SYS_CLK2
6.5.7.4
Alternate GPIO_B Peripheral Function for A21 (A21)—Bit 7
0 = Peripheral output function of GPIOB[5] is defined to be A[21]
1 = Peripheral output function of GPIOB[5] is defined to be SYS_CLK
6.5.7.5
Alternate GPIO_B Peripheral Function for A20 (A20)—Bit 6
0 = Peripheral output function of GPIOB[4] is defined to be A[20]
1 = Peripheral output function of GPIOB[4] is defined to be the prescaler clock (FREF, see Figure 3-4)
Base + $A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read
0
A23
A22
A21
A20
CLK
DIS
CLKOSEL
Write
RESET
0
001
0
000
0
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