參數(shù)資料
型號： MC56F8023VLC
廠商： Freescale Semiconductor
文件頁數(shù)： 5/157頁
文件大小： 0K
描述： IC DSP 16BIT DUAL HARV 32-LQFP
標準包裝： 1,250
系列： 56F8xxx
核心處理器： 56800E
芯體尺寸： 16-位
速度： 32MHz
連通性： I²C，LIN，SCI，SPI
外圍設備： POR，PWM，WDT
輸入/輸出數(shù)： 26
程序存儲器容量： 32KB（16K x 16）
程序存儲器類型： 閃存
RAM 容量： 2K x 16
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 6x12b; D/A 2x12b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 105°C
封裝/外殼： 32-LQFP
包裝： 托盤
56F8033/56F8023 Data Sheet, Rev. 6
102
Freescale Semiconductor
6.3.21.5
Reserved—Bits 7–5
This bit field is reserved. Each bit must be set to 0.
6.3.21.6
Select Peripheral Input Source for TA1 (IPS2_TA1)—Bit 4
This field selects the alternate input source signal to feed Quad Timer A, input 1.
0 = I/O pin (External) - Use Timer A1 input/output pin
1 = CMPAO (Internal) - Use Comparator A output
6.3.21.7
Reserved—Bits 3–0
This bit field is reserved. Each bit must be set to 0.
For Timer A to detect the PWM SYNC signal, the clock rate of both the PWM module and Timer A
module must be identical, at either the system clock rate or 3X system clock rate.
6.4 Clock Generation Overview
The SIM uses the master clock (2X system clock) at a maximum of 64MHz from the OCCS module to
produce a system clock at a maximum of 32MHz for the peripheral, core, and memory. It divides the
master clock by two and gates it with appropriate power mode and clock gating controls. A 3X system
high-speed peripheral clock input from OCCS operates at three times the system clock at a maximum of
96MHz and can be an optional clock for PWM, Timer A, and I2C modules. These clocks are generated by
gating the 3X system high-speed peripheral clock with appropriate power mode and clock gating controls.
The OCCS configuration controls the operating frequency of the SIM’s master clocks. In the OCCS, either
an external clock (CLKIN), a crystal oscillator, or the relaxation oscillator can be selected as the master
clock source (MSTR_OSC). An external clock can be operated at any frequency up to 64MHz. The crystal
oscillator can be operated only at a maximum of 8MHz. The relaxation oscillator can be operated at full
speed (8MHz), standby speed (200kHz using ROSB), or powered down (using ROPD). An 8MHz
MSTR_OSC can be multiplied to 196MHz using the PLL and postscaled to provide a variety of high-speed
clock rates. Either the postscaled PLL output or MSTR_OSC signal can be selected to produce the master
clocks to the SIM. When the PLL is selected, both the 3X system clock and the 2X system clock are
enabled. If the PLL is not selected, the 3X system clock is disabled and the master clock is MSTR_OSC.
In combination with the OCCS module, the SIM provides power modes (see Section 6.5), clock enables,
and clock rate controls to provide flexible control of clocking and power utilization. The clock rate
controls enable the high-speed clocking option for the two quad timers (TMRA and TMRB) and PWM,
but requires the PLL to be on and selected. Refer to the 56F802X and 56F803X Peripheral Reference
Manual for further details. The peripheral clock enable controls can be used to disable an individual
peripheral clock when it is not used.
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